OAI-PMH service for K2N Fedora Commons based repository

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Generalities regarding OAI-PMH protocol

OAI Provider Service Installation

Download from Fedora Commons Services oaiprovider distribution under Fedora Commons 3.0 version. The .src distribution contains under "src/demo/" directory very useful .foxml demo files. See oaiprovider-1.2-src.zip For advanced users, accustomed already with oaiprovider service, the simple oaiprovider-1.2.zip it's enough.

Installation

To install the service:

  • Make sure you have a suitable database installed (MySQL, PostgreSQL, Oracle, or McKoi) and a database user account that can create tables in the database.
  • Make sure your Fedora Repository is running with the Resource Index turned ON. This is necessary because the OAI provider periodically queries the resource index to discover which records of interest have changed.
    • Deploy the oaiprovider.war file into your servlet container.
    • Configure the OAI Provider as described in the Configuration section below.
    • Re-start the Web application (this is often done by restarting the servlet container itself).

How to configure OAI Provider Service

First successful tests

First tests have been performed on a local installed Fedora Commons 3.2. Some elements of the proai.properties file was set as follows: 

proai.validateUpdates = false

After firsts test, step-by-step modification both in K2N Fedora Commons repository and proai.properties file, finally, some results it seems to come into sight. At the request: 

http://localhost:8080/oaiprovider/?verb=ListRecords&metadataPrefix=k2n

The response for new ingested digital object RELS-EXT datastream is: 

<?xml version="1.0" encoding="UTF-8"?>
 <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
                            http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
  <responseDate>2009-11-12T21:38:41Z</responseDate>
  <request verb="ListRecords" metadataPrefix="k2n">http://localhost:8080/oaiprovider/</request>
<ListRecords>
<record xmlns="http://www.openarchives.org/OAI/2.0/">
 <header>
   <identifier>oai:example.org:item22</identifier>
   <datestamp>2009-11-12T21:33:39Z</datestamp>
 </header>
 <metadata>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:fedora="info:fedora/fedora-system:def/relations-external#" xmlns:k2n="http://example.org/k2n/" xmlns:fedora- 
model="info:fedora/fedora-system:def/model#" xmlns="http://www.fedora.info/definitions/" xmlns:oai="http://www.openarchives.org 
/OAI/2.0/">
 <rdf:Description rdf:about="info:fedora/K2N:SI_8fdaa4be929fad338e7442f58c5c13">
      <k2n:Normal_Preview_Availability>online (free)</k2n:Normal_Preview_Availability>
      <k2n:Creation_Date>2008</k2n:Creation_Date>
      <k2n:Scientific_Names>Halimeda tuna (J. Ellis et Solander) J.V.Lamouroux</k2n:Scientific_Names>
      <k2n:Format>jpg</k2n:Format>
      <k2n:Country_Names>Italy</k2n:Country_Names>
      <k2n:Creators>Diego Poloniato</k2n:Creators>
      <k2n:Best_Quality_URI>http://dbiodbs.units.it/quint/al/foto/AL000501.jpg.jpg</k2n:Best_Quality_URI>
      <k2n:Metadata_Creator>Annalisa Falace</k2n:Metadata_Creator>
      <k2n:Best_Quality_Availability>online (free)</k2n:Best_Quality_Availability>
      <k2n:Copyright_Statement>Copyright of the author</k2n:Copyright_Statement>
      <k2n:Normal_Preview_URI>http://dbiodbs.units.it/quint/al/foto/pics/AL000501.jpg.jpg</k2n:Normal_Preview_URI>
      <k2n:License_Statement>To be discussed with the author</k2n:License_Statement>
      <k2n:Collection_By_Resource_ID>Algae_(UNITS)</k2n:Collection_By_Resource_ID>
      <k2n:Resource_ID>http://dbiodbs.units.it/quint/al/foto/AL000501.jpg</k2n:Resource_ID>
      <k2n:Metadata_Language>en</k2n:Metadata_Language>
      <k2n:Taxon_Category>Algae</k2n:Taxon_Category>
      <oai:itemID>oai:example.org:item22</oai:itemID>
     <fedora:isMemberOf rdf:resource="info:fedora/K2N:Collection_1e52cf53dfa639a4c94dc1396f37aa"></fedora:isMemberOf>
     <fedora:serviceProvidedBy rdf:resource="info:fedora/K2N:Provider_4f2e3b2b2b85ac2b1f9638b08b87a8"</fedora:serviceProvidedBy>
   </rdf:Description>
  </rdf:RDF>
 </metadata>
</record>
<record xmlns="http://www.openarchives.org/OAI/2.0/">
 <header>
   <identifier>"""oai:example.org:item22"""</identifier>
   <datestamp>2009-11-12T20:09:51Z</datestamp>
 </header>
 <metadata>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 <rdf:Description rdf:about="info:fedora/demo:SI_ex1">
   <itemID xmlns="http://www.openarchives.org/OAI/2.0/">"oai:example.org:item22"</itemID>
   <isMemberOf xmlns="info:fedora/fedora-system:def/relations-external#" rdf:resource="info:fedora/demo:SetPrime"></isMemberOf>
   <serviceProvidedBy xmlns="info:fedora/fedora-system:def/relations-external#" rdf:resource="info:fedora/demo:SetPrime">
</serviceProvidedBy>
   <Scientific_Names xmlns="http://example.org/k2n/">"Halimeda tuna (J. Ellis et Solander) J.V.Lamouroux"</Scientific_Names>
 </rdf:Description>
</rdf:RDF>
 </metadata>
</record>
<record xmlns="http://www.openarchives.org/OAI/2.0/">
 <header>
   <identifier>"""\\""oai:example.org:item22\\"""""</identifier>
   <datestamp>2009-11-12T20:11:54Z</datestamp>
 </header>
 <metadata>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 <rdf:Description rdf:about="info:fedora/demo:SI_ex1">
   <itemID xmlns="http://www.openarchives.org/OAI/2.0/">"\"oai:example.org:item22\""</itemID>
   <isMemberOf xmlns="info:fedora/fedora-system:def/relations-external#" rdf:resource="info:fedora/demo:SetPrime"></isMemberOf>
   <serviceProvidedBy xmlns="info:fedora/fedora-system:def/relations-external#" rdf:resource="info:fedora/demo:SetPrime"> 
</serviceProvidedBy>
   <Scientific_Names xmlns="http://example.org/k2n/">Halimeda tuna (J. Ellis et Solander) J.V.Lamouroux</Scientific_Names>
 </rdf:Description>
</rdf:RDF>
 </metadata>
</record>
<record xmlns="http://www.openarchives.org/OAI/2.0/">
 <header>
   <identifier>oai:example.org:item23</identifier>
   <datestamp>2009-11-12T21:13:26Z</datestamp>
 </header>
 <metadata>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"  
xmlns:fedora="info:fedora/fedora-system:def/relations-external#" xmlns:k2n="http://example.org/k2n/"  
xmlns:oai="http://www.openarchives.org/OAI/2.0/" xmlns:fedora-model="info:fedora/fedora-system:def/model#" 
xmlns="http://www.fedora.info/definitions/">
              <rdf:Description rdf:about="info:fedora/demo:SI_ex2">
                 <k2n:Normal_Preview_Availability>online (free)</k2n:Normal_Preview_Availability>
                 <k2n:Creation_Date>2008</k2n:Creation_Date>
                 <k2n:Scientific_Names>Halimeda tuna (J. Ellis et Solander) J.V.Lamouroux</k2n:Scientific_Names>
                 <k2n:Format>jpg</k2n:Format>
                 <k2n:Country_Names>Italy</k2n:Country_Names>
                 <k2n:Creators>Diego Poloniato</k2n:Creators>
                 <k2n:Best_Quality_URI>http://dbiodbs.units.it/quint/al/foto/AL000500.jpg.jpg</k2n:Best_Quality_URI>
                 <k2n:Metadata_Creator>Annalisa Falace</k2n:Metadata_Creator>
                 <k2n:Best_Quality_Availability>online (free)</k2n:Best_Quality_Availability>
                 <k2n:Copyright_Statement>Copyright of the author</k2n:Copyright_Statement>
                 <k2n:Normal_Preview_URI>http://dbiodbs.units.it/quint/al/foto/pics/AL000500.jpg.jpg</k2n:Normal_Preview_URI>
                 <k2n:License_Statement>To be discussed with the author</k2n:License_Statement>
                 <k2n:Collection_By_Resource_ID>Algae_(UNITS)</k2n:Collection_By_Resource_ID>
                 <k2n:Resource_ID>http://dbiodbs.units.it/quint/al/foto/AL000500.jpg</k2n:Resource_ID>
                 <k2n:Metadata_Language>en</k2n:Metadata_Language>
                 <k2n:Taxon_Category>Algae</k2n:Taxon_Category>
                 <oai:itemID>oai:example.org:item23</oai:itemID>
                 <fedora:isMemberOf rdf:resource="info:fedora/K2N:Collection_1e52cf53dfa639a4c94dc1396f37aa"></fedora:isMemberOf>
                 <fedora:serviceProvidedBy rdf:resource="info:fedora/K2N:Provider_4f2e3b2b2b85ac2b1f9638b08b87a8"> 
</fedora:serviceProvidedBy>
              </rdf:Description>
           </rdf:RDF>
 </metadata>
</record>
<record xmlns="http://www.openarchives.org/OAI/2.0/">
 <header>
   <identifier>K2N:SI_8fdaa4be929fad338e7442f58c5c13</identifier>
   <datestamp>2009-11-12T21:37:42Z</datestamp>
 </header>
 <metadata>

For updated RELS-EXT datastream, the response is: 

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
 <rdf:Description rdf:about="info:fedora/K2N:SI_8fdaa4be929fad338e7442f58c5c13">
   <Normal_Preview_Availability xmlns="http://example.org/k2n/">"online (free)"</Normal_Preview_Availability>
   <Creation_Date xmlns="http://example.org/k2n/">"2008"</Creation_Date>
   <Scientific_Names xmlns="http://example.org/k2n/">"Halimeda tuna (J. Ellis et Solander)  
J.V.Lamouroux&quot</Scientific_Names>
   <Format xmlns="http://example.org/k2n/">"jpg"</Format>
   <Country_Names xmlns="http://example.org/k2n/">"Italy"</Country_Names>
   <Creators xmlns="http://example.org/k2n/">"Diego Poloniato"</Creators>
   <Best_Quality_URI xmlns="http://example.org/k2n/">http://dbiodbs.units.it/quint/al/foto/AL000501.jpg.jpg</Best_Quality_URI>
   <Metadata_Creator xmlns="http://example.org/k2n/">Annalisa Falace</Metadata_Creator>
   <Best_Quality_Availability xmlns="http://example.org/k2n/">online (free)</Best_Quality_Availability>
   <Copyright_Statement xmlns="http://example.org/k2n/">"Copyright of the author"</Copyright_Statement>
   <Normal_Preview_URI xmlns="http://example.org/k2n/">http://dbiodbs.units.it/quint/al/foto  
/pics/AL000501.jpg.jpg</Normal_Preview_URI>
   <License_Statement xmlns="http://example.org/k2n/">"To be discussed with the author"</License_Statement>
   <Collection_By_Resource_ID xmlns="http://example.org/k2n/">"Algae_(UNITS)"</Collection_By_Resource_ID>
   <Resource_ID xmlns="http://example.org/k2n/">"http://dbiodbs.units.it/quint/al/foto/AL000501.jpg%22</Resource_ID>
   <Metadata_Language xmlns="http://example.org/k2n/">"en"</Metadata_Language>
   <Taxon_Category xmlns="http://example.org/k2n/">"Algae"</Taxon_Category>
   <itemID xmlns="http://www.openarchives.org/OAI/2.0/">K2N:SI_8fdaa4be929fad338e7442f58c5c13</itemID>
   <isMemberOf xmlns="info:fedora/fedora-system:def/relations-external#"
rdf:resource="info:fedora/K2N:Collection_1e52cf53dfa639a4c94dc1396f37aa"></isMemberOf>
   <serviceProvidedBy xmlns="info:fedora/fedora-system:def/relations-external#" 
rdf:resource="info:fedora/K2N:Provider_4f2e3b2b2b85ac2b1f9638b08b87a8"></serviceProvidedBy>
 </rdf:Description>
</rdf:RDF>
 </metadata>
</record>
</ListRecords>
</OAI-PMH>

Conclusions: Is this service reliable for our purpose or not?

  • It seems that RELS-EXT datastream are treated in a dual manner: as special RELS-EXT datastream for relationships expressions and normal datastream (and we should take advantages from this).
  • A special element is necessary on RELS-EXT datastream, in order to identify the record id for OAI-PMH:
<oai:itemID>K2N:SI_8fdaa4be929fad338e7442f58c5c13</oai:itemID>

Discussions are welcome.

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