[topicmapmail] Fragmented XTM for web metadata, and some ontology?

[Alexander Johannesen]

Hi Murray,

( And sorry for the long post )


I'm trying to understand it all, but my feeble brain don't seem
to be able to grok it; let me know where you think I'm missing
the point. :)

I've been thinking of creating a simple XTM with PSI's based on DC 1.1, 
where you have for the DC element "type" ;

   <rdf:Property rdf:about="http://purl.org/dc/elements/1.1/type">

which has got

   <rdfs:isDefinedBy rdf:resource="http://purl.org/dc/elements/1.1/"/>

for a given element that would satisfy most for a PSIs, as defined as such 
for the DC "type" ;

   <topic id="dc:type">
      <subjectIdentity>
         <subjectIndicatorRef
             xlink:href="http://purl.org/dc/elements/1.1/type" />
      </subjectIdentity>
   </topic>

( id-attributes follow the DC recomended guideline for DC in XML )

I had some problems groking the associative DC metadata in Jan's document, 
but that might be because I don't understand why
they should be expressed that way. Maybe my thinking is very
slow, but I'd like an ontology (called FXTM for now) ;

[baseNames simplified]

   <topic id="fxtm">
      <subjectIdentity>
         <subjectIndicatorRef
             xlink:href="http://purl.org/tm/psi/fxtm" />
      </subjectIdentity>
      <name>FXTM</name>
   </topic>

   <topic id="fxtm:page">
      <instanceOf>
         <topicRef xlink:href="#fxtm"/>
      </instanceOf>
      <subjectIdentity>
         <subjectIndicatorRef
             xlink:href="http://purl.org/tm/psi/fxtm#page" />
      </subjectIdentity>
      <name>A page</name>
   </topic>

   <topic id="fxtm:association">
      <instanceOf>
         <topicRef xlink:href="#fxtm"/>
      </instanceOf>
      <subjectIdentity>
         <subjectIndicatorRef
             xlink:href="http://purl.org/tm/psi/fxtm#association" />
      </subjectIdentity>
      <name>An association</name>
   </topic>

   <topic id="fxtm:link">
      <instanceOf>
         <topicRef xlink:href="#fxtm:association"/>
      </instanceOf>
      <subjectIdentity>
         <subjectIndicatorRef
             xlink:href="http://purl.org/tm/psi/fxtm#link" />
      </subjectIdentity>
      <name>A link</name>
   </topic>

My thinking says that for a given page, you have the following XTM;

   <!-- root node is the fragmented XTM's resource -->

   <topic id="root">
      <instanceOf>
         <topicRef xlink:href="#fxtm:page"/>
      </instanceOf>
      <occurrence>
         <instanceOf>
            <topicRef xlink:href="#dc:title" />
         </instanceOf>
         <resourceData>Some title</resourceData>
      </occurrence>
      <occurrence>
         <instanceOf>
            <topicRef xlink:href="#dc:date:publish" />
         </instanceOf>
         <resourceData>[Some date]</resourceData>
      </occurrence>
   </topic>

Where the TMs for FXTM and DC are implicit part of the
namespaces used (and merged in according to the FXTM
spec?).

I don't know. Maybe I'm mixing things up too much, or
maybe I'm missing the incredible power of making the
occurrences topics instead with associations binding them, but I feel that 
becomes more of an application
specific way than a general "here is the resources"
way;

   <topic id="murray">
      <instanceOf>
         <topicRef xlink:href="#fxtm:person"/>
      </instanceOf>
      <name>Murray Altheim</name>
   </topic>

   <topic id="murrays-site">
      <instanceOf>
         <topicRef xlink:href="#fxtm:site"/>
      </instanceOf>
      <occurrence>
         <instanceOf xlink:href="#dc:identifier" />
         <resourceData>[Some URL]</resourceData>
      </occurrence>
      <occurrence>
         <instanceOf xlink:href="#dc:title" />
         <resourceData>Some title</resourceData>
      </occurrence>
   </topic>

   <association>
      <instanceOf>
         <topicRef xlink:href="#fxtm:link"/>
      </instanceOf>
      <member>
         <roleSpec>
            <topicRef xlink:href="#fxtm:linked"/>
         </roleSpec>
         <topicRef xlink:href="#murray"/>
      </member>
      <member>
         <roleSpec>
            <topicRef xlink:href="#fxtm:linked-ref"/>
         </roleSpec>
         <topicRef xlink:href="#murrays-site"/>
      </member>
      <member>
         <roleSpec>
            <topicRef xlink:href="#fxtm:linker"/>
         </roleSpec>
         <topicRef xlink:href="#root"/>
      </member>
   </association>

Basically, what I want is a PSI set for the FXTM set
(both roles and types), and a set of PSIs for DC. The
latter is the easy part. Where should I turn for the former? Is there 
anyone looking into a loose web
browsing ontology?


Kind regards,

Alexander
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