ORE User Guide - Resource Map Implementation in Atom

17 October 2008

This version:
http://www.openarchives.org/ore/1.0/atom
Latest version:
http://www.openarchives.org/ore/atom
Previous version:
http://www.openarchives.org/ore/0.9/atom
http://www.openarchives.org/ore/0.9/atom-implementation
Editors (OAI Executive)
Carl Lagoze, Cornell University Information Science
Herbert Van de Sompel, Los Alamos National Laboratory
Editors (ORE Technical Committee)
Pete Johnston, Eduserv Foundation
Michael Nelson, Old Dominion University
Robert Sanderson, University of Liverpool
Simeon Warner, Cornell University Information Science

Abstract

Open Archives Initiative Object Reuse and Exchange (OAI-ORE) defines standards for the description and exchange of aggregations of Web resources. OAI-ORE introduces the notion of a Resource Map that describes an Aggregation. A Resource Map asserts which Aggregation it describes, and which resources are constituents of the Aggregation (the Aggregated Resources). In addition, a Resource Map can express relationships and types pertaining to the Aggregation, the Aggregated Resources, the Resource Map itself, and to resources related to them. Each Aggregation may be described by one or more Resource Maps, each of which must have exactly one representation that is a serialization of the Resource Map according to a specific format. This document details a Resource Map serialization based on the Atom syndication format, in which each Resource Map is expressed as an Atom entry.

The intended audience for this document is implementers that have an understanding of both Atom and ORE concepts. Readers that want a high-level understanding of the motivation for ORE, and of the solution it provides should read the [ORE Primer].

Table of Contents

1. Introduction
    1.1 Notational Conventions
    1.2 Namespaces
    1.3 Compliance
2. Populating Elements
    2.1 Creating the Skeleton of a Resource Map
    2.2 Adding Metadata About the Resource Map
    2.3 Adding Metadata About the Aggregation
    2.4 Adding Aggregated Resources
3. Common Scenarios
    3.1 Related Versions
    3.2 References and Citations
    3.3 Metadata About Aggregated Resources
      3.3.1 Describing the Splash Page
      3.3.2 Describing the Metadata
      3.3.3 Format Relationships
      3.3.4 Authorship of Aggregated Resources
      3.3.5 Proxies
      3.3.6 The Complete Resource Map
    3.4 Other Scenarios
      3.4.1 Multiply Aggregated Resources
      3.4.2 Nested Aggregations
4. Correspondence between the ORE Model and the Atom Model
    4.1 Mapping between the ORE Model and the Atom Model:Basics
    4.2 Mapping between the ORE Model and the Atom Model: Atom Elements and RDF Triples
5. References

Appendices

A. Acknowledgments
B. Extended Example
C. Schematron Schema for Resource Map Profile of Atom
D. GRDDL crosswalk from Atom XML to RDF/XML
E. Change Log


1. Introduction

This implementation guide describes serialization of ORE Resource Maps using the Atom Syndication Format [RFC4287]. The purpose of this document is to provide guidance to application developers on how to implement Atom-based Resource Maps (Resource Maps), which are based on Atom entry documents. For the purposes of discovery these entry documents can be linked to directly or can be syndicated in Atom feeds. The Resource Maps are entirely self-contained in the entry documents and the Atom feeds in which they may be included have no ORE semantics. Please see [ORE User Discovery] for a full discussion of Resource Map discovery mechanisms.

This document is a combination of tutorial and reference guide. It is structured as:

1.1 Notational Conventions

The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

This specification uses the same shorthands to terms from the XML Infoset [XML Infoset] as used in [RFC4287]: the phrase "Information Item" is omitted when naming Element Information Items and Attribute Information Items. Therefore, when this specification uses the term "element," it is referring to an Element Information Item in Infoset terms. Likewise, when it uses the term "attribute," it is referring to an Attribute Information Item.

This specification uses the common term URI [RFC3986] to mean both IRI [RFC3987] and URI.

1.2 Namespaces

This specification uses the following namespaces and prefixes:

Prefix Namespace URI Description
atom http://www.w3.org/2005/Atom Atom namespace
dc http://purl.org/dc/elements/1.1/ Dublin Core elements
dcterms http://purl.org/dc/terms/ Dublin Core terms
foaf http://xmlns.com/foaf/0.1/ FOAF vocabulary terms
ore http://www.openarchives.org/ore/terms/ ORE vocabulary terms
oreatom http://www.openarchives.org/ore/atom/ ORE Atom elements
rdf http://www.w3.org/1999/02/22-rdf-syntax-ns# RDF vocabulary terms
rdfs http://www.w3.org/2000/01/rdf-schema# RDF vocabulary terms

1.3 Compliance

Atom serializations of Resource Maps MUST be compliant with the Atom Syndication Format [RFC4287]. Moreover, they MUST adhere to the semantic mapping between the ORE Model [ORE Model] and the Atom model detailed Section 4. Specifically, an Atom representation of a Resource Map MUST be a well-formed XML document that is valid according to the Relax NG Compact Schema of [RFC4287]. Moreover, it MUST be valid according to the more specific Schematron Schema of Appendix C that further restricts the Atom syntax to represent Resource Maps.

2. Populating the Entry Document Elements

Resource Maps are expressed as Atom entry documents [RFC4287]. These entry documents can either be linked to directly or gathered together in an Atom feed for syndication (see [ORE User Discovery] for a full discussion of discovery techniques). Although the primary purpose of Atom-based Resource Maps is for machine processing, their relative simplicity should allow for human readability as well.

In this section, we incrementally build up an example Resource Map, mapping the concepts of the ORE Data Model [ORE Model] to their corresponding Atom elements. Throughout this document, we will use the following arXiv e-print (first introduced in the [ORE Primer]) as the defining example:

http://arxiv.org/abs/astro-ph/0601007

This is an interesting example because it has multiple identifiers, versions, formats, mirrors and external relationships. Although the actual URIs may be different in the future, for this document we will assume the existence of two Resource Maps (URI-R) and an Aggregation (URI-A):

http://arxiv.org/rem/atom/astro-ph/0601007 (URI-R of Atom XML Resource Map)
http://arxiv.org/rem/rdf/astro-ph/0601007 (URI-R of RDF/XML Resource Map)
http://arxiv.org/aggregation/astro-ph/0601007 (URI-A)

The subsections below provide a step-by-step build-up of a Resource Map for the above arXiv e-print, culminating in a minimal but complete Resource Map that later sections will further expand. In each section, the bold XML corresponds to the concepts newly introduced in that section.

2.1 Creating the Skeleton of a Resource Map

We begin by creating the skeleton of a Resource Map. We begin with the Atom elements that have no ORE semantics and exist only to facilitate processing and display of the Resource Map serialized as an Atom entry document. First, we use a tag: URI [RFC4151] for the /entry/id element. This element has no ORE semantics and is used only for Atom-specific processing (e.g., detecting duplications among entry documents discovered from different feeds). Authors MAY reuse an existing ORE URI (e.g., URI-A) for /entry/id, but it is RECOMMENDED to create an Atom-specific URI for this purpose (e.g., tag URIs [RFC4151], uuids [RFC4122], and info URIs [RFC4452]).

Second, we put the URI of the splash page in the /entry/link[@rel="alternate"]/@href element. This rel value has no ORE semantics, but Atom processors will use this URI for linking when creating a human readable display of the entry document. If there is no suitable candidate for this link, /entry/content must be used (see Table 1 below).

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

</entry>

2.2 Adding Metadata About the Resource Map

In this section, we add to the Resource Map elements that express metadata about the Resource Map itself.

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

</entry>

2.3 Adding Metadata About the Aggregation

arXiv has OAI-PMH Dublin Core metadata for its e-prints and the full metadata record will be included as a separate Aggregated Resource in the section below. However, that does not assist in the presentation and processing of the Resource Map itself. In this section we focus on including just enough metadata in the Resource Map to make it useful, but without competing with complex metadata formats.

Expressing the authors and title of the Aggregation in the Atom /entry/author and /entry/title, respectively, makes the Resource Map more human readable and more usable in standard syndication tools (e.g., Google Reader).

The creation and modification times of the Aggregation (distinct from those of the Resource Map) are provided using /entry/category elements. Categories are also used to assert that this is an ORE Aggregation as well as possibly other semantic types.

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

  <!-- Aggregation Metadata -->
  <title>Parametrization of K-essence and Its Kinetic Term</title>
  <author>
    <name>Hui Li</name>
    <email>lihui@somewhere.cn</email>
  </author>
  <author>
    <name>Zong-Kuan Guo</name>
  </author>
  <author>
    <name>Yuan-Zhong Zhang</name>
  </author>
  <link rel="http://www.openarchives.org/ore/terms/isDescribedBy" href="http://arxiv.org/rem/rdf/astro-ph/0601007"/>
  <category term="2005-12-31T04:01:23Z" scheme="http://www.openarchives.org/ore/atom/created"/>
  <category term="http://www.openarchives.org/ore/terms/Aggregation" label="Aggregation" 
  scheme="http://www.openarchives.org/ore/terms/" />
  <category term="2006-01-18T06:16:15Z" scheme="http://www.openarchives.org/ore/atom/modified"/>
  <category term="http://purl.org/eprint/type/JournalArticle" 
  scheme="http://purl.org/eprint/type/" label="Journal Article"/>

</entry>

2.4 Adding Aggregated Resources

Aggregated Resources are represented in Atom-based Resource Maps with /entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@href elements. For the arXiv e-print example, we aggregate the:

If the Aggregated Resources have distinctly separate titles from the Aggregation, we use the /entry/link/[@title] attributes accordingly (e.g., different versions of PostScript). We also use other optional attributes, such as /entry/link/[@type] and /entry/link/[@hreflang], where possible. It is important to note that the Resource Map is more than just an XML-encoded version of the splash page. The arXiv splash page does not contain direct links to the DVI, LaTeX or three of the PostScript versions of the e-print (they are one level "down" from splash page), and the Dublin Core metadata is not linked to at all from the splash page.

Expanding our skeleton Resource Map, we now have:

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

  <!-- Aggregation Metadata -->
  <title>Parametrization of K-essence and Its Kinetic Term</title>
  <author>
    <name>Hui Li</name>
    <email>lihui@somewhere.cn</email>
  </author>
  <author>
    <name>Zong-Kuan Guo</name>
  </author>
  <author>
    <name>Yuan-Zhong Zhang</name>
  </author>
  <link rel="http://www.openarchives.org/ore/terms/isDescribedBy" href="http://arxiv.org/rem/rdf/astro-ph/0601007"/>
  <category term="2005-12-31T04:01:23Z" scheme="http://www.openarchives.org/ore/atom/created"/>
  <category term="http://www.openarchives.org/ore/terms/Aggregation" label="Aggregation" 
  scheme="http://www.openarchives.org/ore/terms/" />
  <category term="2006-01-18T06:16:15Z" scheme="http://www.openarchives.org/ore/atom/modified"/>
  <category term="http://purl.org/eprint/type/JournalArticle" 
  scheme="http://purl.org/eprint/type/" label="Journal Article"/>

  <!-- Aggregated Resources -->
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/abs/astro-ph/0601007" 
  title="[astro-ph/0601007] Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/pdf/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/pdf" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (600 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (300 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"
  title="Parametrization of K-essence and Its Kinetic Term (Type I Fonts PostScript)" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/dvi/astro-ph/0601007"
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/dvi" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=astro-ph/0601007" 
  title="Dublin Core Metadata for Parametrization of K-essence and Its Kinetic Term" 
  type="application/xml"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/cits/astro-ph/0601007" 
  title="Citations for astro-ph/0601007" type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007" 
  title="Citebase - Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>

</entry>

3. Common Scenarios

The previous section covered the basics of building an Atom-based Resource Map. In this section we review the appropriate techniques within the Atom ORE Specification for handling common scenarios for Aggregations that go beyond the basics covered above.

3.1 Related Versions

There are a number of methods to link to resources that are related to the Aggregation. In this section, we illustrate three kinds of related resources and the recommended /entry/link/[@rel] values.

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

  <!-- Aggregation Metadata -->
  <title>Parametrization of K-essence and Its Kinetic Term</title>
  <author>
    <name>Hui Li</name>
    <email>lihui@somewhere.cn</email>
  </author>
  <author>
    <name>Zong-Kuan Guo</name>
  </author>
  <author>
    <name>Yuan-Zhong Zhang</name>
  </author>
  <link rel="http://www.openarchives.org/ore/terms/isDescribedBy" href="http://arxiv.org/rem/rdf/astro-ph/0601007"/>
  <category term="2005-12-31T04:01:23Z" scheme="http://www.openarchives.org/ore/atom/created"/>
  <category term="http://www.openarchives.org/ore/terms/Aggregation" label="Aggregation" 
  scheme="http://www.openarchives.org/ore/terms/" />
  <category term="2006-01-18T06:16:15Z" scheme="http://www.openarchives.org/ore/atom/modified"/>
  <category term="http://purl.org/eprint/type/JournalArticle" 
  scheme="http://purl.org/eprint/type/" label="Journal Article"/> 
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v1"/>
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v2"/>
  <link rel="related" href="http://jp.arxiv.org/aggregation/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:arxiv/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:doi/10.1142/S0217732306019475"/>

  <!-- Aggregated Resources -->
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/abs/astro-ph/0601007" 
  title="[astro-ph/0601007] Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/pdf/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/pdf" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (600 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (300 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"
  title="Parametrization of K-essence and Its Kinetic Term (Type I Fonts PostScript)" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/dvi/astro-ph/0601007"
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/dvi" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=astro-ph/0601007" 
  title="Dublin Core Metadata for Parametrization of K-essence and Its Kinetic Term" 
  type="application/xml"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/cits/astro-ph/0601007" 
  title="Citations for astro-ph/0601007" type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007" 
  title="Citebase - Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>

</entry>

3.2 References and Citations

In this example, we demonstrate two methods for including citations to and from the e-print Aggregation. Although, services that dynamically compute citations to and from this e-print are included as Aggregated Resources (section 2.4 above), we can also link individual citations to and from with /entry/link/[@rel="http://purl.org/dc/terms/isReferencedBy"]/@href and /entry/link/[@rel="http://purl.org/dc/terms/references"]/@href elements. In this example, we show two examples of citations that reference this e-print. We also use /entry/link/[@title] to make for a better display. Also note that the target URIs of these rels are also URIs that identify Aggregations.

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

  <!-- Aggregation Metadata -->
  <title>Parametrization of K-essence and Its Kinetic Term</title>
  <author>
    <name>Hui Li</name>
    <email>lihui@somewhere.cn</email>
  </author>
  <author>
    <name>Zong-Kuan Guo</name>
  </author>
  <author>
    <name>Yuan-Zhong Zhang</name>
  </author>
  <link rel="http://www.openarchives.org/ore/terms/isDescribedBy" href="http://arxiv.org/rem/rdf/astro-ph/0601007"/>
  <category term="2005-12-31T04:01:23Z" scheme="http://www.openarchives.org/ore/atom/created"/>
  <category term="http://www.openarchives.org/ore/terms/Aggregation" label="Aggregation" 
  scheme="http://www.openarchives.org/ore/terms/" />
  <category term="2006-01-18T06:16:15Z" scheme="http://www.openarchives.org/ore/atom/modified"/>
  <category term="http://purl.org/eprint/type/JournalArticle" 
  scheme="http://purl.org/eprint/type/" label="Journal Article"/> 
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v1"/>
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v2"/>
  <link rel="related" href="http://jp.arxiv.org/aggregation/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:arxiv/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:doi/10.1142/S0217732306019475"/> 
  <link rel="http://purl.org/dc/terms/isReferencedBy" href="http://arxiv.org/aggregation/0807.1020"
  title="How the Scalar Field of Unified Dark Matter Models Can Cluster"/>
  <link rel="http://purl.org/dc/terms/isReferencedBy" href="http://arxiv.org/aggregation/0806.4327"
  title="Cosmological scalar fields that mimic the $\Lambda CDM$ cosmological model"/>

  <!-- Aggregated Resources -->
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/abs/astro-ph/0601007" 
  title="[astro-ph/0601007] Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/pdf/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/pdf" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (600 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (300 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"
  title="Parametrization of K-essence and Its Kinetic Term (Type I Fonts PostScript)" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/dvi/astro-ph/0601007"
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/dvi" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=astro-ph/0601007" 
  title="Dublin Core Metadata for Parametrization of K-essence and Its Kinetic Term" 
  type="application/xml"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/cits/astro-ph/0601007" 
  title="Citations for astro-ph/0601007" type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007" 
  title="Citebase - Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>

</entry>

3.3 Metadata About Aggregated Resources

There may be scenarios in which you wish to convey additional metadata about the Aggregation and Aggregated Resources. The examples above have covered common scenarios that can be handled with /entry/link and /entry/category elements. However, some statements cannot be expressed using native Atom elements.

These statements MAY be included using the oreatom:triples extension element. At the time of this writing, although some mechanisms for expressing triples in the Atom Syndication Format have been proposed, none have are finalized or have reached critical mass in the community. Until that happens we RECOMMEND that triples be expressed with oreatom:triples. We anticipate an easy migration path from oreatom:triples to whichever syntax the community adopts in the future.

These RDF/XML statements MUST all be "connected" to one of the following URIs:

That is, there must be at least one triple with one of those URIs as the subject or object. Only after a resource has appeared in such a triple may it be used as the subject or object of a subsequent triple. This results in a set of trples "connected" to the Aggregation.

3.3.1 Describing the Splash Page

In this section we want to further describe the splash page. We have already used the /entry/link/[@rel="alternate"]/@href element above (section 2.1). But this is only an Atom-specific convention; to unambiguously state that one of the Aggregated Resources is a splash page, we use an rdf:Description element and use the terminology info:eu-repo/semantics/humanStartPage. The example further describes the type info:eu-repo/semantics/humanStartPage by adding rdfs:label and rdfs:isDefinedBy properties. Although these property triples do not have an Aggregated Resource as the subject, they are permitted because they are "connected" to the Aggregated Resource via the resource info:eu-repo/semantics/humanStartPage.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://arxiv.org/abs/astro-ph/0601007">
            <rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage"/>
        </rdf:Description>
        <rdf:Description rdf:about="info:eu-repo/semantics/humanStartPage">
            <rdfs:label>humanStartPage</rdfs:label>
            <rdfs:isDefinedBy rdf:resource="info:eu-repo/semantics/"/>
        </rdf:Description>
  </oreatom:triples>
...

3.3.2 Describing the Metadata

Unlike the splash page, there is no Atom-specific convention to hint at which Aggregated Resource is descriptive metadata. We again use a info:eu-repo/ URI, but we also assert the metadata format of the Aggregated Resource.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://export.arxiv.org/oai2?verb=GetRecord&metadataPrefix=oai_dc&identifier=astro-ph/0601007">
            <dcterms:conformsTo rdf:resource="http://www.openarchives.org/OAI/2.0/oai_dc/"/>
            <rdf:type rdf:resource="info:eu-repo/semantics/descriptiveMetadata"/>
        </rdf:Description>
  </oreatom:triples>
...

3.3.3 Format Relationships

The Aggregation has many Aggregated Resources, but not all are similar content; this Aggregation includes metadata, full text and citations. Some Aggregated Resources, such as the full text, share the property that they are expressions of the same content in different formats. For example, we can asssert that the PDF and PostScript versions are different formats of each other. In this example, we also identify the format of the PDF Aggregated Resource by means of a format URI for PDF accorded by the Pronom Format Registry.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://arxiv.org/ps/astro-ph/0601007">
            <dcterms:hasFormat rdf:resource="http://arxiv.org/pdf/astro-ph/0601007"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&dpi=600&font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&dpi=300&font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&fname=cm&font=TypeI"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/dvi/astro-ph/0601007"/>
        </rdf:Description>
  </oreatom:triples>
...

3.3.4 Authorship of Aggregated Resources

Sometimes there is metadata about Aggregated Resources that cannot be expressed in the various attributes of the /entry/link/ element. This metadata also appears in the oreatom:triples element. In the section, we show how we state the authorship of the CiteBase.org Aggregated Resource.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007">
            <dcterms:creator rdf:parseType="Resource">
                <foaf:name>The Citebase Project</foaf:name>
                <foaf:page rdf:resource="http://www.citebase.org/"/>
                <foaf:mbox rdf:resource="mailto:tdb01r@ecs.soton.ac.uk"/>
            </dcterms:creator>
        </rdf:Description>
  </oreatom:triples>
...

3.3.5 Proxies

Proxies are defined by the ORE data model [ORE Model] and their implementation is discussed in [ORE HTTP]. In summary, Proxies provide a way to identify an Aggregated Resource in the context of a particular Aggregation. Proxy URIs allow us to distinguish between URI-AR as it exists in its own right, or as it appears as part of distinct Aggregations, say URI-A1 and URI-A2.

Using Proxies enables the establishment of lineage: the assertion that an Aggregated Resource originated or was sourced from another Aggregation (see [ORE Model] for a full discussion of Proxies and lineage). Authors wishing to express lineage SHOULD link to (in HTML) or aggregate (in Resource Maps) the URI of a Proxy instead of URI-AR.

The use of Proxies is not mandatory in the ORE Model. If they are used in Atom Resource Maps, they are expressed in the oreatom:triples element.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://oreproxy.org/r?what=http://arxiv.org/cits/astro-ph/0601007&where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/cits/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
  </oreatom:triples>
...

3.3.6 The Complete Resource Map

In this section, we pull together all the concepts introduced in sections 3.3.1 - 3.3.5 into a single Resource Map with a single oreatom:triples element. The XML namespaces at the beginning of the document have been updated as well. This Resource Map is more expressive than the Resource Map in sections 2.4 or 3.2, although it no longer uses only native Atom elements.

<?xml version="1.0" encoding="utf-8"?>
<entry xmlns="http://www.w3.org/2005/Atom"
       xmlns:oreatom="http://www.openarchives.org/ore/atom/"
       xmlns:dcterms="http://purl.org/dc/terms/"
       xmlns:dc="http://purl.org/dc/elements/1.1/"
       xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
       xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
       xmlns:ore="http://www.openarchives.org/ore/terms/"
       xmlns:foaf="http://xmlns.com/foaf/0.1/"
       xmlns:grddl="http://www.w3.org/2003/g/data-view#" 
       grddl:transformation="http://www.openarchives.org/ore/atom/atom-grddl.xsl">

  <!-- Atom Specific; No ORE Semantics -->
  <id>tag:arxiv.org,2008:astro-ph:0601007</id>
  <link rel="alternate" type="text/html" href="http://arxiv.org/abs/astro-ph/0601007"/>

  <!-- Resource Map Metadata -->
  <link rel="self" type="application/atom+xml" href="http://arxiv.org/rem/atom/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/describes" href="http://arxiv.org/aggregation/astro-ph/0601007"/>
  <source>
        <author>
            <name>arXiv.org e-Print Repository</name>
            <uri>http://arXiv.org</uri>
        </author>
        <id>tag:arxiv.org,2008:astro-ph</id>
        <updated>2008-10-03T07:30:34Z</updated>
        <title>arXiv.org Astrophysics Feed</title>
  </source>
  <published>2008-10-01T18:30:02Z</published>
  <updated>2007-10-10T18:30:02Z</updated>
  <link rel="license" type="application/rdf+xml" href="http://creativecommons.org/licenses/by-nc/2.5/rdf" />
  <rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</rights>

  <!-- Aggregation Metadata -->
  <title>Parametrization of K-essence and Its Kinetic Term</title>
  <author>
    <name>Hui Li</name>
    <email>lihui@somewhere.cn</email>
  </author>
  <author>
    <name>Zong-Kuan Guo</name>
  </author>
  <author>
    <name>Yuan-Zhong Zhang</name>
  </author>
  <link rel="http://www.openarchives.org/ore/terms/isDescribedBy" href="http://arxiv.org/rem/rdf/astro-ph/0601007"/>
  <category term="2005-12-31T04:01:23Z" scheme="http://www.openarchives.org/ore/atom/created"/>
  <category term="http://www.openarchives.org/ore/terms/Aggregation" label="Aggregation" 
  scheme="http://www.openarchives.org/ore/terms/" />
  <category term="2006-01-18T06:16:15Z" scheme="http://www.openarchives.org/ore/atom/modified"/>
  <category term="http://purl.org/eprint/type/JournalArticle" 
  scheme="http://purl.org/eprint/type/" label="Journal Article"/> 
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v1"/>
  <link rel="http://purl.org/dc/terms/hasVersion" href="http://arxiv.org/aggregation/astro-ph/0601007v2"/>
  <link rel="related" href="http://jp.arxiv.org/aggregation/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:arxiv/astro-ph/0601007"/>
  <link rel="http://www.openarchives.org/ore/terms/similarTo" href="info:doi/10.1142/S0217732306019475"/> 
  <link rel="http://purl.org/dc/terms/isReferencedBy" href="http://arxiv.org/aggregation/0807.1020"
  title="How the Scalar Field of Unified Dark Matter Models Can Cluster"/>
  <link rel="http://purl.org/dc/terms/isReferencedBy" href="http://arxiv.org/aggregation/0806.4327"
  title="Cosmological scalar fields that mimic the $\Lambda CDM$ cosmological model"/>

  <!-- Aggregated Resources -->
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/abs/astro-ph/0601007" 
  title="[astro-ph/0601007] Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/pdf/astro-ph/0601007" 
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/pdf" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (600 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"
  title="Parametrization of K-essence and Its Kinetic Term (300 DPI Bitmapped Fonts PostScript)"
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"
  title="Parametrization of K-essence and Its Kinetic Term (Type I Fonts PostScript)" 
  type="application/postscript" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/dvi/astro-ph/0601007"
  title="Parametrization of K-essence and Its Kinetic Term" 
  type="application/dvi" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007" 
  title="Dublin Core Metadata for Parametrization of K-essence and Its Kinetic Term" 
  type="application/xml"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://arxiv.org/cits/astro-ph/0601007" 
  title="Citations for astro-ph/0601007" type="text/html" hreflang="en"/>
  
  <link rel="http://www.openarchives.org/ore/terms/aggregates" 
  href="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007" 
  title="Citebase - Parametrization of K-essence and Its Kinetic Term" 
  type="text/html" hreflang="en"/>

  <!-- Additional properties pertaining to Aggregated Resources and Aggregation -->
    <oreatom:triples>
        <!-- About the Aggregation -->
        <rdf:Description rdf:about="http://arxiv.org/aggregation/astro-ph/0601007">
            <dcterms:audience rdf:parseType="Resource">
                <rdf:value>OCLC audience level 1: research</rdf:value>
            </dcterms:audience>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/abs/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/abs/astro-ph/0601007">
            <rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage"/>
        </rdf:Description>
        <rdf:Description rdf:about="info:eu-repo/semantics/humanStartPage">
            <rdfs:label>humanStartPage</rdfs:label>
            <rdfs:isDefinedBy rdf:resource="info:eu-repo/semantics/"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/abs/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/abs/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/abs/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/ps/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/ps/astro-ph/0601007">
            <dcterms:hasFormat rdf:resource="http://arxiv.org/pdf/astro-ph/0601007"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/dvi/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/pdf/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/pdf/astro-ph/0601007">
            <dcterms:conformsTo rdf:resource="info:pronom/fmt/18"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/pdf/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/pdf/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/pdf/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007?dpi%3d600%26font%3dbitmapped&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007?dpi=600&amp;font=bitmapped"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007?dpi%3d300%26font%3dbitmapped&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007?dpi=300&amp;font=bitmapped"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007?fname%3dcm%26font%3dTypeI&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007?fname=cm&amp;font=TypeI"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/dvi/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/dvi/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/dvi/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007">
            <dcterms:conformsTo rdf:resource="http://www.openarchives.org/OAI/2.0/oai_dc/"/>
            <rdf:type rdf:resource="info:eu-repo/semantics/descriptiveMetadata"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://export.arxiv.org/oai2?verb%3dGetRecord%26metadataPrefix%3doai_dc%26identifier%3doai:arXiv.org:astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor
                rdf:resource="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/cits/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/cits/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/cits/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007">
            <dcterms:creator rdf:parseType="Resource">
                <foaf:name>The Citebase Project</foaf:name>
                <foaf:page rdf:resource="http://www.citebase.org/"/>
                <foaf:mbox rdf:resource="mailto:tdb01r@ecs.soton.ac.uk"/>
            </dcterms:creator>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://www.citebase.org/abstract?id%3doai:arXiv.org:astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor
                rdf:resource="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
    </oreatom:triples>

</entry>

3.4 Other Scenarios

This section introduces two common scenarios that are not covered by the arXiv example. Both examples use the oreatom:triples extension element.

3.4.1 Multiply Aggregated Resources

Imagine that we know that the splash page for this e-print has been aggregated by an ORE-compliant blog. If we wanted to acknowledge this, in the oreatom:triples section that is about the splash page, we could use the http://www.openarchives.org/ore/tems/isAggregatedBy predicate.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://arxiv.org/abs/astro-ph/0601007">
            <rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage"/>
            <ore:isAggregatedBy rdf:resource="http://blogs.foo.com/bob/2008/10/02/dark-energy/>
        </rdf:Description>
        <rdf:Description rdf:about="info:eu-repo/semantics/humanStartPage">
            <rdfs:label>humanStartPage</rdfs:label>
            <rdfs:isDefinedBy rdf:resource="info:eu-repo/semantics/"/>
        </rdf:Description>
  </oreatom:triples>
...

3.4.2 Nested Aggregations

If an Aggregated Resources is also an Aggregation, the term http://www.openarchives.org/ore/terms/Aggregation SHOULD be used to indicate as such. This allows for the "nesting" or hierarchical collection of Aggregations. For example, if the arXiv citation service, via content negotiation (see [ORE HTTP]), could return both an HTML page and an Aggregation, we could indicate this by adding a statement in the oreatom:triples element. This would provide a processing "hint" to the agent processing this Resource Map that the Aggregated Resource is also an Aggregation.

...
  <oreatom:triples>
        <rdf:Description rdf:about="http://arxiv.org/cits/astro-ph/0601007">
            <rdf:type rdf:resource="http://www.openarchives.org/ore/terms/Aggregation"/>
        </rdf:Description>
  </oreatom:triples>
...

4. Correspondence between the ORE Model and the Atom Model

4.1. Mapping between the ORE Model and the Atom Model: An Overview

The approach to express entities from the ORE Model in Atom can be summarized as follows:

  1. An Aggregation is described by an Atom entry; the Resource Map that describes the Aggregation is an Atom entry XML document.
  2. The atom:id child element of atom:entry has no meaning in the ORE Model. It is aglobally unique identifier reserved for Atom-specific processing.
  3. The atom:content child element of atom:entry has no meaning in the ORE Model. It is an element to convey Atom content.
  4. All atom:link elements that have a rel attribute value that is registered in the IANA Atom Links Relations Registry have an Atom-specific meaning. As described in (5) below, the atom:link elements with theIANA-registered rel attribute values self and license also have a meaning in the ORE Model.
  5. The URI-R of the Resource Map that describes the Aggregation is expressed as the value of the href attribute of an atom:link element that has a rel attribute value of "self".
    1. The following child elements of atom:entry that are in the Atom namespace pertain to the Resource Map: atom:published, atom:updated, atom:rights, the atom:link element that has a rel attribute value of "license", and the atom:author child elements of atom:source.
  6. The URI-A of the Aggregation described by the Atom entry is expressed as the value of the href attribute of a special-purpose ORE atom:link element that has a rel attribute value of "http://www.openarchives.org/ore/terms/describes".
    1. All atom:link elements thathave a rel attribute value in the ORE namespace (http://www.openarchives.org/ore/terms/) pertain to the Aggregation.
    2. Except for the Atom elements mentioned in (5) above, all child elements of atom:entry that are in the Atom namespace pertain to the Aggregation.
  7. The URI-AR of an Aggregated Resource of the Aggregation is expressed as the value of the href attribute of an atom:link element that has a rel attribute value of "http://www.openarchives.org/ore/terms/aggregates", which is in the ORE namespace (http://www.openarchives.org/ore/terms/).
  8. The triples element from the ORE namespace (http://www.openarchives.org/ore/terms/) is an ORE-specific Atom extension element introduced to express RDF metadata pertaining to the Aggregation, the Resource Map, the Aggregated Resources, and resources related to those, which can not be expressed using elements from the Atom namespace. ORE processors SHOULD treat the contentof the triples element as an integral part of the Atom Resource Map.
  9. Other child elements of atom:entry have no ORE-specific meaning and MAY be ignored by ORE processors.

4.2. Mapping between the ORE Model and the Atom Model: Atom Elements and corresponding RDF Triples

Figure 1 illustrates the mapping between entities from the Atom and ORE models, whereas Table 1 provides the explicit mapping details.

Figure 1: Mapping between basic items from the ORE and Atom models
ORE Atom mapping

 

Table 1 is organized in the following sections:

In Table 1, elements that are mandatory in the Atom serialization are highlighted. Note that the column "ORE Abstract Model and RDF Triples" of Table 1 indicates how elements of an Atom-based Resource Map MUST be mapped to RDF triples. As shown, some predicates for these RDF triples are in the ore namespace, while others are in other, commonly used namespaces listed in Section 1.2. The mapping between an Atom-based Resource Map and RDF triples is undefined for those elements found in the Resource Map that are not covered in Table 1; such elements MAY be ignored by ORE processors.

Table 1: The elements of an Atom entry used to express an OREResource Map, and the associated RDF Triples
Atom Entry Item Atom representation ORE Abstract Model and RDF Triples
Specific to Atom
Entry id

/entry/id

[RFC3987] [RFC3986]

This element conveys the globally unique identifier of the Atom entry.

Subject of the triple:

URI-R dcterms:isVersionOf /entry/id

Entry Content

/entry/content

If no content element is provided, the use of a link element with a rel attribute value of alternate is REQUIRED.

No mapping defined
Entry Link Element: Target and Properties

/entry/link

The link elements that have a rel attribute value that isregistered in the IANA Atom Links Relations Registry have an Atom-specific meaning.

  • The link element that has a rel attribute value of self also has a meaning in the ORE Model. The use of this link element is REQUIRED. See About the Resource Map, below.
  • The link element that has a rel attribute value of license also has a meaning in the ORE Model. See About the Resource Map, below.
  • The use of link elements with a rel attribute value ofalternate is RECOMMENDED. See About the Aggregation, below. If no content element is provided, the use of this link element is REQUIRED.
  • The use of link elements with a rel attribute value ofrelated is RECOMMENDED. See About the Aggregation, below.

The link elements that have a rel attribute value in the ORE namespace (http://www.openarchives.org/ore/terms/) pertain to the Aggregation. See About the Aggregation, below.

No mapping defined, except for the rel values self, license, alternate and related. See About theAggregation and About the Resource Map, below .

URIs of Aggregation, Resource Map and Aggregated Resources
Entry Link "http://www.openarchives.org/ore/terms/describes": Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/describes"]/@href

[RFC3987] [RFC3986]

This link conveys the URI (URI-A) of the Aggregation.

The other attributes of this link element (hreflang, title, type, length) SHOULD NOT be used.

 

URI-A

[URI of the Aggregation].

Through combination with the information from the row below, the following triple results:

URI-R ore:describes URI-A

Entry Link "self": Target and Properties

/entry/link[@rel="self"]/@href

This link conveys the URI (URI-R) of the Resource Map.

[RFC3987] [RFC3986]

/entry/link[@rel="self"]/@hreflang

/entry/link[@rel="self"]/@title

/entry/link[@rel="self"]/@type

/entry/link[@rel="self"]/@length

It is RECOMMENDED to use the type attribute of this link, in which caseits value MUST be application/atom+xml.

URI-R

[URI of the Resource Map from which an Atom-based representation describing the Aggregation is retrievable]

Object of the triples:

URI-R dc:language "language"

URI-R dc:title "title"

URI-R dc:format "type"

URI-R dcterms:extent "length"

[Metadata about the Atom-based Resource Map]

Through combination with the information from the row above, the following triple results:

URI-R ore:describes URI-A

Entry Link "http://www.openarchives.org/ore/terms/aggregates": Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@href

This link conveys the URI (URI-AR) of an Aggregated Resource.

[RFC3987] [RFC3986]

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@hreflang

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@title

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@type

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@length

Object of the triple:

URI-A ore:aggregates URI-AR

[URI-AR of the Aggregated Resource]

Objects of the respective triples:

URI-AR dc:language "language"

URI-AR dc:title "title"

URI-AR dc:format "type"

URI-AR dcterms:extent "length"

About the Aggregation
Entry Link "http://www.openarchives.org/ore/terms/describes": Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/describes"]/@href

[RFC3987] [RFC3986]

This link conveys the URI (URI-A) of the Aggregation.

The other attributes of this link element (hreflang, title, type, length) SHOULD NOT be used.

 

URI-A

[URI of the Aggregation]

Entry Author

/entry/author

/entry/author/name
/entry/author/email

/entry/author/uri

This element is used to convey the authors of the Aggregation.

It is highly RECOMMENDED to have an author element in order to overwrite the default Atom behavior by which the author of an Atom feed is inherited by an Atom entry if the entry itself does not specify an author.

It is RECOMMENDED to use a URI for the identification of an author.

The triples:

URI-A dcterms:creator URI-b

URI-b foaf:name "author name"

URI-b foaf:mbox URI-author-email

URI-b foaf:page URI-author

Note that URI-b designates a blank node.

Note that /entry/author/email is a string, not a URI. Hence URI-author-email must be created by prepending mailto: to that string.

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Entry Category Term, Scheme, Label

/entry/category/@term

/entry/category/@scheme

/entry/category/@label

Categories MAY be provided to express a type of the Aggregation. An example is using a Category to type the Aggregation as a journal article.

It is RECOMMENDED to use a URI as the value of the term attribute.

It is RECOMMENDED to provide a value for the scheme attribute and for thatvalue to be a URI.

If the value of term is a URI, the triples:

URI-A rdf:type URI-term

URI-term rdfs:label "label"

If the value of scheme is a URI, the OPTIONAL triple:

URI-term rdfs:isDefinedBy URI-scheme

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

[Relationships to other Resources and Types]

Entry Category Term "http://www.openarchives.org/ore/terms/Aggregation" One Category MUST be provided with a value for the term attribute of "http://www.openarchives.org/ore/terms/Aggregation" and a value of the scheme attribute of "http://www.openarchives.org/ore/terms/". In this case, it is RECOMMENDED to use a value for the label attribute of "Aggregation"

The triple:

URI-A rdf:type ore:Aggregation

And the OPTIONAL triples:

ore:Aggregation rdfs:isDefinedBy http://www.openarchives.org/ore/terms/

ore:Aggregation rdfs:label "Aggregation"

Entry Category Term with creation datetime value

One Category MAY be provided with a value for the term attribute equal to an ISO 8601 datetime, and a value for the scheme attribute of "http://www.openarchives.org/ore/atom/created". This Category is used to convey the datetime of creation of an Aggregation.

[RFC3339]

Format SHOULD be "YYYY-MM-DDThh:mm:ssZ"

The object of the triple:

URI-A dcterms:created "datetime"

Entry Category Term with modification datetime value

One Category MAY be provided with a value for the term attribute equal to an ISO 8601 datetime, and a value for the scheme attribute of "http://www.openarchives.org/ore/atom/modified". This Category is used to convey the datetime of modification of an Aggregation.

[RFC3339]

Format SHOULD be "YYYY-MM-DDThh:mm:ssZ"

The object of the triple:

URI-A dcterms:modified "datetime"

Entry Contributor

/entry/contributor

/entry/contributor/name
/entry/contributor/email

/entry/contributor/uri

This element is used to convey the contributors to the Aggregation.

It is RECOMMENDED to use a URI for the identification of a contributor.

The triples:

URI-A dcterms:contributor URI-b

URI-b foaf:name "author name"

URI-b foaf:mbox URI-author-email

URI-b foaf:page URI-author

Note that URI-b designates a blank node.

Note that /entry/contributor/email is a string, not a URI. Hence URI-contributer-email must be created by prepending mailto: to that string.

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Entry Link "alternate": Target and Properties

/entry/link[@rel="alternate"]/@href

[RFC3987] [RFC3986]

It is RECOMMENDED to use this link element to reference a human readable representation of the Atom entry. Since the entry describes an Aggregation, this representation is likely to convey a human readable description of that Aggregation.

/entry/link[@rel="alternate"]/@hreflang

/entry/link[@rel="alternate"]/@title

/entry/link[@rel="alternate"]/@type

/entry/link[@rel="alternate"]/@length

Object of the triple:

URI-A rdfs:seeAlso URI-alternate

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Objects of the respective triples:

URI-alternate dc:language "language"

URI-alternate dc:title "title"

URI-alternate dc:format "type"

URI-alternate dcterms:extent "length"

[Relationships to other Resources and Types]

Entry "related" Link: Target and Properties

/entry/link[@rel="related"]/@href

[RFC3987] [RFC3986]

It is RECOMMENDED to use this link element to reference a resource related to the Atom entry.Since the entry describes an Aggregation, this resource is likely to also be related to the Aggregation.

/entry/link[@rel="related"]/@hreflang

/entry/link[@rel="related"]/@title

/entry/link[@rel="related"]/@type

/entry/link[@rel="related"]/@length

Object of the triple:

URI-A rdfs:seeAlso URI-related

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Objects of the respective triples:

URI-related dc:language "language"

URI-related dc:title "title"

URI-related dc:format "type"

URI-related dcterms:extent "length"

[Relationships to other Resources and Types]

Entry "http://www.openarchives.org/ore/terms/isDescribedBy" Link: Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/isDescribedBy"]/@href

[RFC3987] [RFC3986]

If a Resource Map exists that describes the Aggregation using serialization format other than Atom, it is RECOMMENDED to convey the URI (URI-R) of this other Resource Map using this link. An example is a pointer to a Resource Map expressed in RDF/XML.

/entry/link[@rel="http://www.openarchives.org/ore/terms/isDescribedBy"]/@hreflang

/entry/link[@rel="http://www.openarchives.org/ore/terms/isDescribedBy"]/@title

/entry/link[@rel="http://www.openarchives.org/ore/terms/isDescribedBy"]/@type

/entry/link[@rel="http://www.openarchives.org/ore/terms/isDescribedBy"]/@length

Object of the triple:

URI-A ore:isDescribedBy URI-R-other

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Objects of the respective triples:

URI-R-other dc:language "language"

URI-R-other dc:title "title"

URI-R-other dc:format "type"

URI-R-other dcterms:extent "length"

[Relationships between the Aggregation and Similar Resources]

Entry "http://www.openarchives.org/ore/terms/similarTo" Link: Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/similarTo"]/@href

[RFC3987] [RFC3986]

It is RECOMMENDED to use this link element to express URIs of resources that are somehow equivalent to the Aggregation. Examples are info:doi/... , http://dx.doi.org/... , etc.

/entry/link[@rel="http://www.openarchives.org/ore/terms/similarTo"]/@hreflang

/entry/link[@rel="http://www.openarchives.org/ore/terms/similarTo"]/@title

/entry/link[@rel="http://www.openarchives.org/ore/terms/similarTo"]/@type

/entry/link[@rel="http://www.openarchives.org/ore/terms/similarTo"]/@length

Object of the triple:

URI-A ore:similarTo URI-similar

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Objects of the respective triples:

URI-similar dc:language "language"

URI-similar dc:title "title"

URI-similar dc:format "type"

URI-similar dcterms:extent "length"

[Relationships between the Aggregation and Similar Resources]

Entry Summary /entry/summary

Object of the triple:

URI-A dcterms:abstract "summary"

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Entry Title /entry/title

Object of the triple:

URI-A dc:title "title"

[Relationships to other Resources and Types (pertaining to the Aggregation) ]

Entry extension element oreatom:triples

/entry/oreatom:triples

This ORE-specific extension element MAY be used to convey properties and types pertaining to the Aggregation, the Resource Map, the Aggregated Resources, and other related resources that can not be conveyed using the native Atom elements listed in this Table.

The content of this element is RDF/XML and SHOULD consist of one or more rdf:Description elements as explained in the ORE User Guide: Resource Map Implementationin RDF/XML.

An example use of this element for an Aggregation would be to assert a triple that has the Aggregation as the subject and a literal as the object. Such a triple can not be expressed using theatom:link element because the value of the href attribute (where the object of the triple would be conveyed) must be a URI.

The content of the oreatom:triples element expresses triplesin RDF/XML.

About the Resource Map
Entry Link "self": Target and Properties

/entry/link[@rel="self"]/@href

This link conveys the URI (URI-R) of the Resource Map.

[RFC3987] [RFC3986]

/entry/link[@rel="self"]/@hreflang

/entry/link[@rel="self"]/@title

/entry/link[@rel="self"]/@type

/entry/link[@rel="self"]/@length

It is RECOMMENDED to use the type attribute of this link, in which case its value MUST be application/atom+xml.

URI-R

[URI of the Resource Map from which an Atom-based representation describing the Aggregation is retrievable]

URI-R dc:language "language"

URI-R dc:title "title"

URI-R dc:format "type"

URI-R dcterms:extent "length"

Entry Link "license": Target and Properties

/entry/link[@rel=">license"]/@href

[RFC3987] [RFC3986] [RFC4946]

This link element is used to provide the URI of a rights description that pertains to the Resource Map. It is RECOMMENDED that the rights description is machine-readable. An example is the URI of a Creative Common license that dereferences to an RDF/XML rights description.

/entry/link[@rel="license"]/@hreflang

/entry/link[@rel="license"]/@title

/entry/link[@rel="license"]/@type

/entry/link[@rel="license"]/@length

Object of the triple:

URI-R dcterms:rights URI-rights

[Metadata about the Atom-based Resource Map]

URI-rights dc:language "language"

URI-rights dc:title "title"

URI-rights dc:format "type"

URI-rights dcterms:extent "length"

Entry Publication Datetime

/entry/published

[RFC3339]

This element is used to provide the datetime of creation of the Resource Map.

Format SHOULD be "YYYY-MM-DDThh:mm:ssZ"

Object of the triple:

URI-R dcterms:created "published"

[Metadata about the Atom-based Resource Map]

Entry Updated Datetime

/entry/updated

[RFC3339]

This element is used to provide the datetime of modification of the Resource Map. Format SHOULD be "YYYY-MM-DDThh:mm:ssZ"

Object of the triple:

URI-R dcterms:modified "updated"

[Metadata about the Atom-based Resource Map]

Entry Rights

/entry/rights

This element is used to provide a human readable description of the rights that pertain to the Resource Map.

Object of the triple:

URI-R dc:rights "rights"

[Metadata about the Atom-based Resource Map]

Entry Source, Author child element

/entry/source/author

/entry/source/author/name
/entry/source/author/email

/entry/source/author/uri

This element MUST be used to convey the author of the Resource Map.

The triples:

URI-R dcterms:creator URI-b

URI-b foaf:name "author name"

URI-b foaf:mbox URI-author-email

URI-b foaf:page URI-author

Note that URI-b designates a blank node.

Note that /entry/source/author/email is a string, not a URI. Hence URI-author-email must be created by prepending mailto: to that string.

[Metadata about the Atom-based Resource Map]

Entry Source, child elements other than Author

These elements MAY be used to convey information about an Atom feed in which the Atom-based Resource Map is contained. Use of the following elements is RECOMMENDED:

/entry/source/id

/entry/source/link[@rel="self"]/@href

/entry/source/title

/entry/source/updated


The triples:

URI-entry-id dcterms:isPartOf URI-feed-id

URI-feed-id rdfs:seeAlso URL-feed

URI-feed-id dc:title "title"

URI-feed-id dcterms:modified "updated"

Entry extension element oreatom:triples

/entry/oreatom:triples

This ORE-specific extension element MAY be used to convey properties and types pertaining to the Aggregation, the Resource Map, the Aggregated Resources, and other related resources that can not be conveyed using the native Atom elements listed in this Table.

The content of this element is RDF/XML and SHOULD consist of one or more rdf:Description elements as explained in the ORE User Guide: Resource Map Implementationin RDF/XML.

The content of the oreatom:triples element expresses triplesin RDF/XML.

About the Aggregated Resources
Entry Link "http://www.openarchives.org/ore/terms/aggregates": Target and Properties

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@href

This link conveys the URI (URI-AR) of an Aggregated Resource.

[RFC3987] [RFC3986]

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@hreflang

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@title

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@type

/entry/link[@rel="http://www.openarchives.org/ore/terms/aggregates"]/@length

Object of the triple:

URI-A ore:aggregates URI-AR

[URI-AR of the Aggregated Resource]

Objects of the respective triples:

URI-AR dc:language "language"

URI-AR dc:title "title"

URI-AR dc:format "type"

URI-AR dcterms:extent "length"

Entry extension element oreatom:triples

/entry/oreatom:triples

This ORE-specific extension element MAY be used to convey properties and types pertaining to the Aggregation, the Resource Map, the Aggregated Resources, and other related resources that can not be conveyed using the native Atom elements listed in this Table.

The content of this element is RDF/XML and SHOULD consist of one or more rdf:Description elements as explained in the ORE User Guide: Resource Map Implementationin RDF/XML.

All properties of an Aggregated Resource, except for the ones that can be conveyed using the hreflang, title, type and length attributes of atom:link must be expressed using the oreatom:triples extension element. This includes the Proxy URIsfor Aggregated Resources.

The content of the oreatom:triples element expresses triplesin RDF/XML.

5. References

[ORE HTTP]
ORE User Guide - HTTP Implementation, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/http.
[ORE Model]
ORE Specification - Abstract Data Model, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/datamodel.
[ORE Vocabulary]
ORE Specification - Vocabulary, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/vocabulary.
[ORE Primer]
ORE User Guide - Primer, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/primer.
[ORE User Guide Resource Map]
ORE User Guide - Resource Map Implementation in Atom, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/atom.
[ORE User Guide RDF Syntax]
ORE User Guide - Representing Resource Maps Using RDF Syntaxes, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/rdfsyntax.
[ORE User Guide Discovery]
ORE User Guide - Resource Map Discovery, C. Lagoze, H. Van de Sompel, P. Johnston, M. Nelson, R. Sanderson, S. Warner, 17 October 2008, Available at http://www.openarchives.org/ore/1.0/discovery.
[RDF CONCEPTS]
Resource Description Framework (RDF): Concepts and Abstract Syntax, G. Klyne, Carroll J. February 2004. Available at http://www.w3.org/TR/rdf-concepts/.
[RFC2119]
IETF RFC 2119: Key words for use in RFCs to Indicate Requirement Levels, S. Bradner, March 1997. Available at http://www.ietf.org/rfc/rfc2119.txt.
[RFC2616]
IETF RFC 2616: Hypertext Transfer Protocol - HTTP/1.1, R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P.Leach, T. Berners-Lee, June 1999. Available at http://www.ietf.org/rfc/rfc2616.txt.
[RFC2822]
IETF 2822: Internet Message Format, P. Resnick, April 2001. Available at http://www.ietf.org/rfc/rfc2822.txt.
[RFC3339]
IETF 3339: Date and Time on the Internet: Timestamps, G. Klyne, C. Newman, July 2002, Available at http://www.ietf.org/rfc/rfc3339.txt.
[RFC3986]
IETF RFC 3986: Uniform Resource Identifier (URI): Generic Syntax, T. Berners-Lee, R. Fielding, L. Masinter, January 2005. Available at http://www.ietf.org/rfc/rfc3986.txt.
[RFC3987]
IETF RFC 3987: Internationalized Resource Identifiers (IRIs), M. Duerst, M. Suignard, January 2005. Available at http://www.ietf.org/rfc/rfc3987.txt.
[RFC4122]
IETF RFC 4122:A Universally Unique IDentifier (UUID) URN Namespace, P. Leach, M. Mealling, R. Salz, July 2005. Available at http://www.ietf.org/rfc/rfc4122.txt.
[RFC4151]
IETF RFC 4151:The 'tag' URI Scheme, T. Kindberg, S. Hawke, October 2005. Available at http://www.ietf.org/rfc/rfc4151.txt.
[RFC4287]
IETF RFC 4287: The Atom Syndication Format, M. Nottingham, R. Sayre, December 2005. Available at http://www.ietf.org/rfc/rfc4287.txt.
[XML Infoset]
W3C XML Infoset (Second Edition), J. Cowan, R. Tobin, February 2004, Available at http://www.w3.org/TR/xml-infoset/.
[RFC4452]
IETF RFC 4452:The "info" URI Scheme for Information Assets with Identifiers in Public Namespaces, H. Van de Sompel, T. Hammond, Manifest Solutions, S. Weibel, April 2006. Available at http://www.ietf.org/rfc/rfc4452.txt.

A. Acknowledgements

This document is the work of the Open Archives Initiative. Funding for Open Archives Initiative Object Reuse and Exchange is provided by the Andrew W. Mellon Foundation, Microsoft, and the National Science Foundation.  Additional support is provided by the Coalition for Networked Information.

This document is based on meetings of the OAI-ORE Technical Committee (ORE-TC), with participation from the OAI-ORE Liaison Group (ORE-LG).  Members of the ORE-TC are: Chris Bizer (Freie Universität Berlin), Les Carr (University of Southampton), Tim DiLauro (Johns Hopkins University), Leigh Dodds (Ingenta), David Fulker (UCAR), Tony Hammond (Nature Publishing Group), Pete Johnston (Eduserv Foundation), Richard Jones (Imperial College), Peter Murray (OhioLINK), Michael Nelson (Old Dominion University), Ray Plante (NCSA and National Virtual Observatory), Rob Sanderson (University of Liverpool), Simeon Warner (Cornell University), and Jeff Young (OCLC).  Members of ORE-LG are: Leonardo Candela (DRIVER), Tim Cole (DLF Aquifer and UIUC Library), Julie Allinson (JISC), Jane Hunter (DEST), Savas Parastatidis  (Microsoft), Sandy Payette (Fedora Commons), Thomas Place (DARE and University of Tilburg), Andy Powell (DCMI), and Robert Tansley (Google, Inc. and DSpace)

We also acknowledge comments from the OAI-ORE Advisory Committee (ORE-AC).

Many thanks to the Digital Library Research & Prototyping Team of the Los Alamos National Laboratory for their inspiring explorations into Atom and ORE space: Lyudmilla Balakireva, Ryan Chute, Stephan Drescher, Alberto Pepe, Zhiwu Xie.

B. Extended Example

A rich Resource Map for the arXiv document is shown below and is available here.

<?xml version="1.0" encoding="UTF-8"?>
<atom:entry
    xmlns:dcterms="http://purl.org/dc/terms/" 
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:ore="http://www.openarchives.org/ore/terms/"
    xmlns:oreatom="http://www.openarchives.org/ore/atom/"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:grddl="http://www.w3.org/2003/g/data-view#"
    grddl:transformation="http://www.openarchives.org/ore/atom/atom-grddl.xsl">
    
    <!-- Information about the Atom entry -->
    <!--                                  -->
    
    <atom:id>tag:arxiv.org,2008:astro-ph:0601007</atom:id>
    
    <!-- Information about the Aggregation -->
    <!--                                   -->
    
    <!-- Express URI-A: This Atom entry is about URI-A -->
    <atom:link href="http://arxiv.org/aggregation/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/describes"/>
    
    <!-- Aggregation Author (repeatable) -->
    <atom:author>
        <atom:name>Hui Li</atom:name>
        <atom:email>lihui@somewhere.cn</atom:email>
    </atom:author>
    <atom:author>
        <atom:name>Zong-Kuan Guo</atom:name>
    </atom:author>
    <atom:author>
        <atom:name>Yuan-Zhong Zhang</atom:name>
    </atom:author>
    
    <!-- Aggregation Title -->
    
    <atom:title>Parametrization of K-essence and Its Kinetic Term</atom:title>
    
    <!-- Aggregation Summary -->
    <atom:summary>We construct the non-canonical kinetic term of a k-essence field directly from the
        effective equation of state function $w_k(z)$, which describes the properties of the dark
        energy. Adopting the usual parametrizations of equation of state we numerically reproduce
        the shape of the non-canonical kinetic term and discuss some features of the constructed
        form of k-essence.</atom:summary>
    
    <!-- Resources somehow equivalent to the Aggregation  -->
    <atom:link href="info:arxiv/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/similarTo"/>
    <atom:link href="info:doi/10.1142/S0217732306019475"
        rel="http://www.openarchives.org/ore/terms/similarTo"/>    
    
    <!-- Resource Map in another format that describes the Aggregation  -->
    
    <atom:link href="http://arxiv.org/rem/rdf/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/isDescribedBy"
        type="application/rdf+xml"/>
    
    <!-- Human entry page for the Aggregation  -->
    <atom:link href="http://arxiv.org/abs/astro-ph/0601007"
        rel="alternate"/>
    
    <!-- Discovery pointer to a mirrored version of the Aggregation  -->
    <atom:link href="http://jp.arxiv.org/aggregation/astro-ph/0601007"
        rel="related"/>

    <!-- Other versions of the Aggregation -->
    <atom:link href="http://arxiv.org/aggregation/astro-ph/0601007v1"
        rel="http://purl.org/dc/terms/hasVersion"/>
    <atom:link href="http://arxiv.org/aggregation/astro-ph/0601007v2"
        rel="http://purl.org/dc/terms/hasVersion"/>
    
    <!-- Resources that reference the Aggregation -->
    <atom:link href="http://arxiv.org/aggregation/0807.1020"
        rel="http://purl.org/dc/terms/isReferencedBy"
        title="How the Scalar Field of Unified Dark Matter Models Can Cluster"/>
    <atom:link href="http://arxiv.org/aggregation/0806.4327"
        rel="http://purl.org/dc/terms/isReferencedBy"
        title="Cosmological scalar fields that mimic the $\Lambda CDM$ cosmological model"/>

    <!-- Categories for the Aggregation (rdf:type) -->
    <atom:category term="http://www.openarchives.org/ore/terms/Aggregation"
        scheme="http://www.openarchives.org/ore/terms/" label="Aggregation"/>
    <atom:category term="http://purl.org/eprint/type/JournalArticle"
        scheme="http://purl.org/eprint/type/" label="Journal Article"/>
    
    <!-- Creation and Modification date/time of the Aggregation (rdf literals) -->
    <atom:category term="2005-12-31T04:01:23Z"
        scheme="http://www.openarchives.org/ore/atom/created"/>
    <atom:category term="2006-01-18T06:16:15Z"
        scheme="http://www.openarchives.org/ore/atom/modified"/>

    <!-- Information about the Resource Map -->
    <!--                                    -->
    
    <!-- Express URI-R, the URI of the Atom Resource Map  -->
    <atom:link href="http://arxiv.org/rem/atom/astro-ph/0601007"
        rel="self"
        type="application/atom+xml"/>
    
    <!-- Resource Map Creation and Modification date/time -->
    <atom:published>2008-10-01T18:30:02Z</atom:published>
    <atom:updated>2008-10-03T07:30:34Z</atom:updated>

    <!-- Express rights pertaining to the Atom Resource Map -->
    <atom:link href="http://creativecommons.org/licenses/by-nc/2.5/"
        rel="license"
        type="application/rdf+xml"/>
    <atom:rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</atom:rights>
    
    <!-- Express authorship of Resource Map using atom:source                             -->
    <!-- Also express additional child elements of atom:source that are recommended in Atom -->
    <atom:source>
        <atom:author>
            <atom:name>arXiv.org e-Print Repository</atom:name>
            <atom:uri>http://arXiv.org</atom:uri>
        </atom:author>
        <atom:id>tag:arxiv.org,2008:astro-ph</atom:id>
        <atom:link href="http://arxiv.org/feed/astro-ph"
            rel="self"
            type="application/atom+xml"/>
        <atom:updated>2008-10-03T07:30:34Z</atom:updated>
        <atom:title>ArXiv.org Atrophysics Feed</atom:title>
    </atom:source>
    
    <!-- Express URI to edit this Atom entry via the Atom Publishing Protocol -->
    <atom:link href="http://arxiv.org/edit/astro-ph/0601007"
        rel="edit"/>

    <!-- The Aggregated Resources  -->
    <!--                           -->
    <atom:link href="http://arxiv.org/abs/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="[astro-ph/0601007] Parametrization of K-essence and Its Kinetic Term"
        type="text/html" hreflang="en"/>
    <atom:link href="http://arxiv.org/ps/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term"
        type="application/postscript" hreflang="en"/>
    <atom:link href="http://arxiv.org/pdf/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term"
        type="application/pdf" hreflang="en"/>
    <atom:link href="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=600&amp;font=bitmapped"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term (600 DPI Bitmapped Fonts PostScript)"
        type="application/postscript" hreflang="en"/>
    <atom:link href="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=300&amp;font=bitmapped"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term (300 DPI Bitmapped Fonts PostScript)"
        type="application/postscript" hreflang="en"/>
    <atom:link href="http://arxiv.org/ps/astro-ph/0601007&amp;fname=cm&amp;font=TypeI"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term (Type I Fonts PostScript)"
        type="application/postscript" hreflang="en"/>
    <atom:link href="http://arxiv.org/dvi/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Parametrization of K-essence and Its Kinetic Term"
        type="application/dvi" hreflang="en"/>
    <atom:link
        href="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Dublin Core Metadata for Parametrization of K-essence and Its Kinetic Term"
        type="application/xml"/>
    <atom:link href="http://arxiv.org/cits/astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Citations for astro-ph/0601007" type="text/html" hreflang="en"/>
    <atom:link href="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007"
        rel="http://www.openarchives.org/ore/terms/aggregates"
        title="Citebase - Parametrization of K-essence and Its Kinetic Term" type="text/html"
        hreflang="en"/>

    <!-- Additional properties pertaining to Aggregated Resources and Aggregation -->
    <!--                                                                          -->
    <oreatom:triples>
        <!-- About the Aggregation -->
        <rdf:Description rdf:about="http://arxiv.org/aggregation/astro-ph/0601007">
            <dcterms:audience rdf:parseType="Resource">
                <rdf:value>OCLC audience level 1: research</rdf:value>
            </dcterms:audience>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/abs/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/abs/astro-ph/0601007">
            <rdf:type rdf:resource="info:eu-repo/semantics/humanStartPage"/>
        </rdf:Description>
        <rdf:Description rdf:about="info:eu-repo/semantics/humanStartPage">
            <rdfs:label>humanStartPage</rdfs:label>
            <rdfs:isDefinedBy rdf:resource="info:eu-repo/semantics/"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/abs/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/abs/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/abs/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/ps/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/ps/astro-ph/0601007">
            <dcterms:hasFormat rdf:resource="http://arxiv.org/pdf/astro-ph/0601007"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=600&amp;font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=300&amp;font=bitmapped"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;fname=cm&amp;font=TypeI"/>
            <dcterms:hasFormat rdf:resource="http://arxiv.org/dvi/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://arxiv.org/pdf/astro-ph/0601007 -->
        <rdf:Description rdf:about="http://arxiv.org/pdf/astro-ph/0601007">
            <dcterms:conformsTo rdf:resource="info:pronom/fmt/18"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/pdf/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/pdf/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/pdf/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007&dpi=600&font=bitmapped -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007%26dpi%3d600%26font%3dbitmapped&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=600&amp;font=bitmapped"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007&dpi=300&font=bitmapped -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007%26dpi%3d300%26font%3dbitmapped&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;dpi=300&amp;font=bitmapped"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/ps/astro-ph/0601007&fname=cm&font=TypeI -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/ps/astro-ph/0601007%26fname%3dcm%26font%3dTypeI&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/ps/astro-ph/0601007&amp;fname=cm&amp;font=TypeI"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/dvi/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/dvi/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/dvi/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://export.arxiv.org/oai2?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007">
            <dcterms:conformsTo rdf:resource="http://www.openarchives.org/OAI/2.0/oai_dc/"/>
            <rdf:type rdf:resource="info:eu-repo/semantics/descriptiveMetadata"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://export.arxiv.org/oai2?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://export.arxiv.org/oai2?verb%3dGetRecord%26metadataPrefix%3doai_dc%26identifier%3doai:arXiv.org:astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor
                rdf:resource="http://export.arxiv.org/oai2?verb=GetRecord&amp;metadataPrefix=oai_dc&amp;identifier=oai:arXiv.org:astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://arxiv.org/cits/astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://arxiv.org/cits/astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor rdf:resource="http://arxiv.org/cits/astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
        <!-- Aggregated Resource http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007">
            <dcterms:creator rdf:parseType="Resource">
                <foaf:name>The Citebase Project</foaf:name>
                <foaf:page rdf:resource="http://www.citebase.org/"/>
                <foaf:mbox rdf:resource="mailto:tdb01r@ecs.soton.ac.uk"/>
            </dcterms:creator>
        </rdf:Description>
        <!-- Proxy for Aggregated Resource http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007 -->
        <rdf:Description
            rdf:about="http://oreproxy.org/r?what=http://www.citebase.org/abstract?id%3doai:arXiv.org:astro-ph/0601007&amp;where=http://arxiv.org/aggregation/astro-ph/0601007">
            <ore:proxyFor
                rdf:resource="http://www.citebase.org/abstract?id=oai:arXiv.org:astro-ph/0601007"/>
            <ore:proxyIn rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        </rdf:Description>
    </oreatom:triples>
</atom:entry>

C. Schematron Schema for the Resource Map Profile of Atom

The up-to-date version of the Schematron schema for the Resource Map Profile of Atom is available at http://www.openarchives.org/ore/atom-tron.

D. GRDDL crosswalk from Atom XML to RDF/XML

The up-to-date version of the GRDDL-compliant XSLT to transform an Atom-based serialization of a Resource Map into a serialization in RDF/XML is available at http://www.openarchives.org/ore/atom-grddl.xsl. This XSLT uses XSLT 2.0 functionality. In order to allow Atom-based Resource Maps to be readily transformed in this manner, it is RECOMMENDED to add GRDDL namespace and transformation information as attributes to the atom:entry element, as shown below.

<?xml version="1.0" encoding="UTF-8"?>
<atom:entry xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:grddl="http://www.w3.org/2003/g/data-view#"
    grddl:transformation="http://www.openarchives.org/ore/atom-grddl.xsl">
...

The result of transforming the extended example of Appendix B in this manner is shown below and is also available here. Online transformation engines exist. For example, the W3C's Online XSLT 2.0 service takes the URIs of a stylesheet and an XML document as input.

<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:ore="http://www.openarchives.org/ore/terms/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:grddl="http://www.w3.org/2003/g/data-view#">
    <rdf:Description rdf:about="http://arxiv.org/rem/atom/astro-ph/0601007">
        <rdf:type rdf:resource="http://www.openarchives.org/ore/terms/ResourceMap"/>
        <ore:describes rdf:resource="http://arxiv.org/aggregation/astro-ph/0601007"/>
        <dcterms:modified>2008-10-03T07:30:34Z</dcterms:modified>
        <dcterms:created>2008-10-01T18:30:02Z</dcterms:created>
        <dc:rights>This Resource Map is available under the Creative Commons Attribution-Noncommercial 2.5 Generic license</dc:rights>
        <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc/2.5/"/>
        <dcterms:creator rdf:parseType="Resource">
            <foaf:page rdf:resource="http://arXiv.org"/>
            <foaf:name>arXiv.org e-Print Repository</foaf:name>
        </dcterms:creator>
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E. Change Log

Date Editor Description
2008-10-17 herbertv & mln complete overhaul of ORE-Atom mapping; merger of previous two Atom documents

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