[OAI-implementers] Using dates other than metadata record creation date for data provider "from" and "until" searches

Rob Tice rob.tice at k-int.com
Fri Apr 11 05:53:58 EDT 2008

Hi Lisa


I find that it is always helpful to put yourself in the shoes of someone who
wants to harvest your data. 


If the smallest record count that can be obtained from your system as the
result of an initial OAI ListRecords request (including dates and/or sets)
is very large, it can be quite difficult for harvesting systems to
successfully complete an ‘initial population’ from your data without other
influences (network  connectivity, target response time, resumption token
lifetime etc.) having an increasing bearing on the successful outcome of the


For example, having a repository containing 200,000 records, all dated the
same day and not supporting a request granularity of less than 1 day makes
initial population more difficult for any harvesting system J. 


I do not know how many records you have so this may not be an issue for you
but I think it is worth bearing in mind. 








From: oai-implementers-bounces at openarchives.org
[mailto:oai-implementers-bounces at openarchives.org] On Behalf Of Frederic
Sent: 11 April 2008 07:41
To: lisa at issuelab.com
Cc: oai-implementers at openarchives.org
Subject: Re: [OAI-implementers] Using dates other than metadata record
creation date for data provider "from" and "until" searches



As far as I understand the OAI protocol, I would rather say that DateStamp
is about the last time that your record has been updated (which then must
reflect "create", "update" or "delete"). 

When you will first register your archive into a Harvester, I guess the
harvester will first get all records available. To do so, it will query your
archive without the "from" and "to" parameter. 

Then, most of harvesters will run regularly some incremental harvesting to
get the records modified, deleted or added since the previous harvest. To do
so they will run the query with the "from" parameter.

Kind regards,

Lisa M. Brooks a écrit : 

Hello - We're very close to launching our data provider. Before we do I have
a question about date-stamps.

I understand that the "from" and "until" dates used to request metadata
records refer to the date that the metadata record was created. We are an
archive of research works that date back to the 1980s (we will definitely
get even older works into our archive as we move forward). To my mind it
would be more helpful to folks if our record date-stamps reflect the date
the research work in question was first published.

My concern is that we introduce our repository and harvesters don't get the
gist of the temporal scope of our collection because everything is
date-stamped en masse with the date that we generate our metadata records
(which, with luck, will be this Saturday).

I hope I'm making sense! Just want to know if this is a big no-no, or if
there are things to consider before doing something like this. Appreciate
the insight of list participants.

Thanks for reading -

Lisa M. Brooks
IssueLab - bringing nonprofit research into focus
HYPERLINK "mailto:lisa at issuelab.org"lisa at issuelab.org
HYPERLINK "http://www.issuelab.org"http://www.issuelab.org



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HYPERLINK "http://www.ifremer.fr/avano/"Avano, a marine and aquatic OAI

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