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OSLC Core Appendix B:

RDF/XML Representation Examples DRAFT

By: The OSLC Core Workgroup

Overview

In this appendix we introduce a fictional service with two resource types and then provide examples representations of those resources, a Resource Shape, a Query Resource Shape, a Service Provider and query results in RDF/XML format. These example representations follow the OSLC Core Representations Guidance? which uses a subset of RDF/XML.

Note that clients should be be prepared to any form of RDF/XML not just the one shown in these examples.

Example Resources: fictional OSLC Blog Service

For the sole purpose of providing representation examples, we will define a fictional OSLC Blog Service with two resources: Blog Comment and Blog Entry. Each resource has a small set of required properties and each Comment is associated with an Entry. We will use these definitions in the RDF/XML examples in this appendix and in the JSON, Atom XML and Turtle examples that follow.

For example, we will define the blog entry and blog comment resources as follows:

  • Name: Entry
  • URI: http://open-services.net/ns/bogus/blogs#Entry
  • Properties:
    • dcterms:title (XML Literal, exactly-one) title of Podcast
    • dcterms:modified (DateTime, exactly-one) - date/time that comment was created
    • dcterms:creator (Local In-Line Resource of type foaf:Person, exactly-one) - name of comment author
    • dcterms:content (XML Literal, exactly-one) - content of the comment

  • Name: Comment
  • URI: http://open-services.net/ns/bogus/blogs#Comment
  • Properties:
    • dcterms:modified (DateTime, exactly-one) - date/time that comment was created
    • dcterms:creator (In-Line Resource of type foaf:Person, exactly-one) - name of comment author
    • dcterms:content (XML Literal, exactly-one) - content of the comment
    • blog:entry (Resource, exactly-one of type blog:Entry) - link to the Blog Entry

Next, the RDF/XML examples for the key resources in our fictional OSLC Blog Service.

Resources

Below is an example RDF/XML representation of a blog entry.

URL: http://example.com/blogs/entry/1

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF    
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dcterms="http://purl.org/dc/terms/"    
   xmlns:foaf="http://http://xmlns.com/foaf/0.1/"    
   xmlns:oslc_blog="http://open-services.net/ns/bogus/blogs#">

   <oslc_blog:Entry
      rdf:about="http://example.com/blogs/entry/1">

      <rdf:type 
         rdf:resource="http://open-services.net/ns/bogus/blogs#Entry" />

      <dcterms:title>I love trash</dcterms:title>
      <dcterms:modified>2002-10-10T12:00:00-05:00</dcterms:modified>
      <dcterms:content>
         Anything dirty or dingy or dusty. 
         Anything ragged or rotten or rusty.
      </dcterms:content>
      <dcterms:creator>
         <foaf:Person>
             <foaf:name>Oscar T. Grouch</foaf:name>
         </foaf:Person>
      </dcterms:creator>

   </oslc_blog:Entry>

</rdf:RDF>

Below is an example RDF/XML representation of a blog comment.

URL: http://example.com/comments/1

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF 
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"    
   xmlns:dcterms="http://purl.org/dc/terms/"    
   xmlns:foaf="http://http://xmlns.com/foaf/0.1/"    
   xmlns:oslc_blog="http://open-services.net/ns/bogus/blogs#">

<oslc_blog:Comment 
   rdf:about="http://example.com/comments/1">

   <oslc_blog:entry rdf:resource="http://example.com/blogs/entry/1" />

   <dcterms:content>LOL! Tell us how you really feel, Oscar.</dcterms:content>
   <dcterms:modified>2002-10-10T12:12:23-05:00</dcterms:modified>
   <dcterms:creator>
      <foaf:Person>
          <foaf:name>William B. Bird</foaf:name>
      </foaf:Person>
   </dcterms:creator>

</oslc_blog:Comment>

</rdf:RDF>

Service Provider Resource

Below is an RDF/XML representation of a Service Provider resource for the fictional Blog Service.

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dcterms="http://purl.org/dc/terms/" 
   xmlns:oslc="http://open-services.net/ns/core#"
   xml:lang="en">

<oslc:ServiceProvider 
   rdf:about="http://example.com/service-provider">

   <dcterms:title>Blogging Service</dcterms:title>  
   <dcterms:description>Example OSLC Blog Service</dcterms:description>

   <dcterms:publisher>
      <oslc:Publisher>
         <dcterms:title>OSLC Core Workgroup documentation department</dcterms:title>
         <dcterms:identifier>com.example.oslc.blogservice</dcterms:identifier>
         <oslc:icon rdf:resource="http://example.com/icons/blogservice.ico" />
      </oslc:Publisher>
   </dcterms:publisher>
   
   <oslc:prefixDefinition>
      < oslc:PrefixDefinition >
         <oslc:prefix>rdf</oslc:prefix>
         <oslc:prefixBase>http://www.w3.org/1999/02/22-rdf-syntax-ns#</oslc:prefixBase>
      </oslc:PrefixDefinition >
   </oslc:prefixDefinition >

   < oslc:prefixDefinition >
      < oslc:PrefixDefinition >
         <oslc:prefix>dcterms</oslc:prefix>
         <oslc:prefixBase>http://purl.org/dc/terms/</oslc:prefixBase>
      </oslc:PrefixDefinition >
   </oslc:prefixDefinition >

   < oslc:prefixDefinition >
      < oslc:PrefixDefinition >
         <oslc:prefix>oslc</oslc:prefix>
         <oslc:prefixBase>http://open-services.net/ns/core#</oslc:prefixBase>
      </oslc:PrefixDefinition >
   </oslc:prefixDefinition >

   < oslc:prefixDefinition >
      < oslc:PrefixDefinition >
         <oslc:prefix>oslc_blog</oslc:prefix>
         <oslc:prefixBase>http://open-services.net/ns/bogus/blogs#</oslc:prefixBase>
      </oslc:PrefixDefinition >
   </oslc:prefixDefinition >

   <oslc:service>
      <oslc:Service>
         <oslc:domain>http://example.com/xmlns/example-cm#</oslc:domain>

         <oslc:creationFactory>
            <oslc:CreationFactory>
               <dcterms:title>Location for creation of Blog Entries</dcterms:title>
               <oslc:label>Blog Entries</oslc:label>
               <oslc:creation rdf:resource="http://example.com/creation/entries" />
               <oslc:resourceShape rdf:resource="http://example.com/shapes/blogentry" />
               <oslc:resourceType>http://open-services.net/ns/bogus/blogs#Entry</oslc:resourceType>
               <oslc:usage>http://open-services.net/ns/core#default</oslc:usage>
            </oslc:CreationFactory>
         </oslc:creationFactory>

         <oslc:creationFactory>
            <oslc:CreationFactory>
               <dcterms:title>Location for creation of Blog Comments</dcterms:title>
               <oslc:label>Blog Comments</oslc:label>
               <oslc:creation rdf:resource="http://example.com/creation/comments" />
               <oslc:resourceShape rdf:resource="http://example.com/shapes/blogcomment" />
            </oslc:CreationFactory>
         </oslc:creationFactory>

         <oslc:queryCapability>
            <oslc:QueryCapability>
               <dcterms:title>Blog Entry and Comment Query</dcterms:title>
               <oslc:label>blogquery</oslc:label>
               <oslc:queryBase rdf:resource="http://example.com/query" />
               <oslc:resourceShape rdf:resource="http://example.com/shapes/blogquery" />
            </oslc:QueryCapability>
         </oslc:queryCapability>

      </oslc:Service>
   </oslc:service>

</oslc:ServiceProvider>
</rdf:RDF>

Shape Resources

Below is an example RDF/XML representation of a Resource Shape for the Blog Comment resource defined above.

URL: http://example.com/shapes/commentshape

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF 
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"    
   xmlns:dcterms="http://purl.org/dc/terms/"    
   xmlns:foaf="http://http://xmlns.com/foaf/0.1/"    
   xmlns:oslc="http://open-services.net/ns/core#" >

<oslc:Shape
   rdf:about="http://example.com/shapes/commentshape">

     <dcterms:title>Blog Comment Shape</dcterms:title>
     <rdf:type rdf:resource="http://open-services.net/ns/core#Shape" />

     <oslc:name>Comment</oslc:name>
     <oslc:describes rdf:resource="http://open-services.net/ns/bogus/blog#Comment" />

     <oslc:property>
         <oslc:Property>
             <oslc:name>modified</oslc:name>
             <oslc:occurs>exactly-one</oslc:occurs>
             <oslc:propertyDefinition rdf:resource="http://purl.org/dc/terms/modified" />
             <oslc:valueType rdf:resource="http://www.w3.org/2001/XMLSchema#dateTime" />
         </oslc:Property>
     </oslc:property>

     <oslc:property>
         <oslc:Property>
             <oslc:name>creator</oslc:name>
             <oslc:occurs>exactly-one</oslc:occurs>
             <oslc:propertyDefinition rdf:resource="http://purl.org/dc/terms/creator" />
             <oslc:valueType rdf:resource="http://open-service.net/ns/core#LocalResource" />
             <oslc:representation>Either</oslc:representation>
             <oslc:shape rdf:resource="http://example.com/blogs/personshape" />
         </oslc:Property>
     </oslc:property>

     <oslc:property>
         <oslc:Property>
             <oslc:name>content</oslc:name>
             <oslc:propertyDefinition rdf:resource="http://purl.org/dc/terms/content" />
             <oslc:valueType rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral" />
             <oslc:occurs>exactly-one</oslc:occurs>
         </oslc:Property>
     </oslc:property>

     <oslc:property>
         <oslc:Property>
             <oslc:name>entry</oslc:name>
             <oslc:propertyDefinition rdf:resource="http://open-services.net/ns/bogus/blogs#entry" />
             <oslc:valueType rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral" />
             <oslc:occurs>exactly-one</oslc:occurs>
         </oslc:Property>
     </oslc:property>

</oslc:Shape>

</rdf:RDF>

Query Shape Resource

Below is a Resource Shape that specifies a Query Resource that can have blog entry and blog comment values.

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF 
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dcterms="http://purl.org/dc/terms/"
   xmlns:oslc="http://open-services.net/ns/core#">

<oslc:Shape
     rdf:about="http://example.com/shapes/blogquery">

     <dcterms:title>Blog Query Shape</dcterms:title>
     <rdf:type rdf:resource="http://open-services.net/ns/core#Shape" />

     <oslc:name>BlogQuery</oslc:name>
     <oslc:describes rdf:resource="http://open-services.net/ns/bogus#BlogQuery" />

     <oslc:property>
         <oslc:Property>
             <oslc:name>entry</oslc:name>
             <oslc:occurs>zero-or-many</oslc:occurs>
             <oslc:shape rdf:resource="http://example.com/blogs/entryshape" />
             <oslc:propertyDefinition rdf:resource="http://open-services.net/ns/blog#Entry" />
             <oslc:valueType rdf:resource="http://open-service.net/ns/core#Resource" />
             <oslc:representation>Inline</oslc:representation>
        </oslc:Property>
     </oslc:property>

     <oslc:property>
          <oslc:Property>
             <oslc:name>comment</oslc:name>
             <oslc:occurs>zero-or-many</oslc:occurs>
             <oslc:valueShape rdf:resource="http://example.com/blogs/commentshape" />
             <oslc:propertyDefinition rdf:resource="http://open-services.net/ns/blog#Comment" />
          </oslc:Property>
     </oslc:property>
 
     <oslc:property>
          <oslc:Property>
             <oslc:name>responseInfo</oslc:name>
             <oslc:occurs>zero-or-one</oslc:occurs>
             <oslc:valueShape rdf:resource="http://example.com/blogs/responseInfoShape" />
             <oslc:propertyDefinition rdf:resource="http://open-services.net/ns/core#ResponseInfo" />
             <oslc:valueType rdf:resource="http://open-service.net/ns/core#Resource" />
             <oslc:representation>Inline</oslc:representation>
         </oslc:Property>
     </oslc:property>
 
  </oslc:Shape>

</rdf:RDF>

Query Resource

Below is an example query resource, one which would be returned by the below query on the query capability defined above.

Click HERE to see RDF/XML validation results, triples and RDF graph. 

<rdf:RDF      
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dcterms="http://purl.org/dc/terms/"
   xmlns:oslc="http://open-services.net/ns/core#"      
   xmlns:oslc_blog="http://open-services.net/ns/bogus/blogs#">

     <oslc:ResponseInfo rdf:about="http://example.com/query?oslc.from [...] entry/1&gt;">
         <dcterms:title>Blog Service Query Results for term [remote]</dcterms:title>
     </oslc:ResponseInfo>
     
     <oslc:BlogQuery rdf:about="http://example.com/query?oslc.from [...] entry/1&gt;">
   
        <oslc_blog:comment>
           <oslc_blog:Comment rdf:about="http://example.com/blogs/comment/5">
              <!-- Comment propery values, etc. -->
              <dcterms:title>Comment #5</dcterms:title>
           </oslc_blog:Comment>
        </oslc_blog:comment>
   
        <oslc_blog:comment>
           <oslc_blog:Comment rdf:about="http://example.com/blogs/comment/4">
              <!-- Comment propery values, etc. -->
              <dcterms:title>Comment #4</dcterms:title>
           </oslc_blog:Comment>
        </oslc_blog:comment>
   
        <oslc_blog:comment>
           <oslc_blog:Comment rdf:about="http://example.com/blogs/comment/2">
              <!-- Comment propery values, etc. -->
              <dcterms:title>Comment #2</dcterms:title>
           </oslc_blog:Comment>
        </oslc_blog:comment>
   
        <oslc_blog:comment>
           <oslc_blog:Comment rdf:about="http://example.com/blogs/comment/1">
              <!-- Comment propery values, etc. -->
              <dcterms:title>Comment #1</dcterms:title>
           </oslc_blog:Comment>
        </oslc_blog:comment>
   
        <oslc_blog:comment>
           <oslc_blog:Comment rdf:about="http://example.com/blogs/comment/3">
              <!-- Comment propery values, etc. -->
              <dcterms:title>Comment #3</dcterms:title>
           </oslc_blog:Comment>
        </oslc_blog:comment>
   
       <!-- etc. etc. -->
       
     </oslc:BlogQuery>

</rdf:RDF>
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