[OAI-implementers] Experimental OAI Registry at UIUC

Young,Jeff jyoung@oclc.org
Thu, 9 Oct 2003 17:00:41 -0400


Could you make the Repository Registry OAI harvestable? This might make it
more easily used by automated processes. It would also allow you to dispense
with some of the custom interface and searching you have and use OAI
requests/XSLT to provide the information instead.


>  -----Original Message-----
>  From: Thomas G. Habing [mailto:thabing@uiuc.edu]
>  Sent: Thursday, October 09, 2003 1:52 PM
>  To: oai-implementers@oaisrv.nsdl.cornell.edu
>  Subject: [OAI-implementers] Experimental OAI Registry at UIUC
>  Hi all,
>  This is to announce the availability of a new experimental 
>  registry of OAI 
>  providers.  The registry can be found at:
>     http://oai.grainger.uiuc.edu/registry/
>  The registry was constructed by collecting the baseURLs of 
>  all the providers 
>  we could from various ListFriends.pl sites, Hussein's 
>  repository explorer, 
>  etc., as well as a search tool developed using the Google 
>  SOAP API to search 
>  for possible baseURLs (surprisingly this yielded 30+ new 
>  provider sites). 
>  Once this list of baseURLs was compiled, a crawler harvested 
>  select data 
>  from each provider, such as Identify, ListSets, 
>  ListMetadataFormats, as well 
>  as a collection of sample records, and record counts for 
>  each combination of 
>  set and metadata format (if possible).  The crawler also 
>  traversed to 
>  baseURLs found in friends containers or via the provenance 
>  container from 
>  sample records.  This resulted in a list of about 340 OAI 
>  providers which 
>  are able to respond, plus about 90 providers which seem to 
>  be down.  Many of 
>  these are versions of the same provider using different 
>  versions of the 
>  protocol, still this list is about twice as big as any other 
>  list I've come 
>  across.
>  Plus, it is searchable, which was my primary goal, to make 
>  it easier to find 
>  relevant OAI providers.  Essentially I have constructed a 
>  full-text index on 
>  each repository's Identify, ListSets, ListMetdataFormats, 
>  and a collection 
>  of sample records.
>  I have also done some analysis and made various reports 
>  available, such as 
>  repositories which support compression, a count of the most 
>  frequently 
>  occurring top-level domains, etc.  Check out the "graph of 
>  friends" showing 
>  a graphical representation of interconnections between 
>  repositories either 
>  via friends or provenance.  Did you know that there are 52 
>  distinct XML 
>  metadata schemas in use by OAI repositories!
>  Based on this database I also have developed an experimental 
>  OAI redirector. 
>    If you have an OAI identifier (i.e. oai:PITTAEI.OAI2:558) 
>  but don't know 
>  where it came from, submit it to
>     http://oai.grainger.uiuc.edu/registry/rx?oai:PITTAEI.OAI2:558
>  and you will be redirected to the oai_dc format record for 
>  that id, if an 
>  appropriate baseURL can be found in the registry database.  
>  Unfortunately it 
>  appears than many sites, especially the GenericEprints, are 
>  using the same 
>  repo identifier (see 
>  http://oai.grainger.uiuc.edu/registry/ListRepoIds.asp), 
>  so if there are multiple possible baseURLs for a given id, I 
>  have a ranking 
>  algorithm that attempts to guess the best. I may do some 
>  more work on this 
>  in the future, maybe looking at an OpenURL type resolver function.
>  Anyway, feel free to try it out and let me know of any problems or 
>  suggestions you might have.  Also, if you know of any more 
>  OAI providers I 
>  should add let me know.
>  Kind regards,
>  	Tom
>  -- 
>  Thomas Habing
>  Research Programmer, Digital Library Projects
>  University of Illinois at Urbana-Champaign
>  155 Grainger Engineering Library Information Center, MC-274
>  thabing@uiuc.edu, (217) 244-4425
>  http://dli.grainger.uiuc.edu
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