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revision 26 by norman.x.gray, Wed Jan 9 13:54:36 2008 UTC revision 27 by alasdair.gray, Wed Jan 9 14:18:43 2008 UTC
# Line 496  Line 496 
496  <div class='section'>  <div class='section'>
497  <p class='title'>Relationships Between Vocabularies</p>  <p class='title'>Relationships Between Vocabularies</p>
498    
499  <span class='todo'>[TODO] AG to write a draft for this section</span>  <p>
500    There already exist several vocabularies in the domain of astronomy.
501    Instead of attempting to replace all these existing vocabularies,
502    which have been developed to achieve different aims and user groups,
503    we embrace them.
504    This requires a mechanism to relate the concepts in the different
505    vocabularies.
506    The W3C are in the process of developing a standard for relating the
507    concepts in different SKOS vocabularies <span
508    class='cite'>std:skosMapping</span> and when completed this should be
509    reviewed for use by the IVOA.
510    </p>
511    
512    <p>
513    Four types of relationship are sufficient to capture the relationships
514    between concepts in vocabularies and are similar to those defined for
515    relationships between concepts within a single vocabulary.
516    The relationships are as follows.
517    <span class='todo'>[TODO] Add specifics to the examples.</span>
518    </p>
519  <ul>  <ul>
520  <li>equivalences in external vocabularies, e.g. to the IAU thesaurus  
521  <code>skos:related &lt;iau93:SPIRALGALAXY&gt;</code>  <li>
522  <!--<code>&lt;skos:related rdf:resource="IAU93:SPIRALGALAXY"&gt;</code>-->  Equivalence between concepts, i.e. the concpets in the different
523  (note the use of an external namespace <code>iau93</code> which must  vocabularies refer to the same real world entity.
524  be defined within the document)  This is captured with the following RDF statement
525    <code>iau93:#SPIRALGALAXY map:exactMatch ivoat:#spiralGalaxy</code>
526    which states the the spiral galaxy concept in the IAU thesaurus is the
527    same as the spiral galaxy concept in the IVOAT.
528    (Note the use of an external namespaces <code>iau93</code> and
529    <code>ivoat</code> which must be defined within the document.)
530    </li>
531    
532    <li>
533    Broader concept, i.e. there is not an equivalent concept but there is
534    a more general one.
535    This is captured with the RDF statement <code>iau93:#XXX
536    map:broadMatch ivoat:#YYY</code> which states that the IVOAT concept
537    YYY is more general than the IAU93 concept XXX.
538    </li>
539    
540    <li>
541    Narrower concept, i.e. there is not an equivalent concept but there is
542    a more specific one.
543    This is captured with the RDF statement <code>iau93:#XXX
544    map:narrowMatch ivoat:#YYY</code> which states that the IVOAT concept
545    YYY is more specific than the IAU93 concept XXX.
546    </li>
547    
548    <li>
549    Related concept, i.e. there is some form of relationship.
550    This is captured with the RDF statement <code>iau93:#XXX
551    map:relatedMatch ivoat:#YYY</code> which states that the IAU93 concept
552    XXX has an association with the IVOAT concept YYY.
553  </li>  </li>
554    
555  </ul>  </ul>
556    
557    <p>
558    <span class='todo'>[TODO:] Enter text regarding the resolution of
559    issue 7.</span>
560    </p>
561    
562  </div>  </div>
563    
564  <div class='section'>  <div class='section'>
# Line 594  Line 647 
647  SKOS standard <span class="cite">std:skoscore</span>.</p>  SKOS standard <span class="cite">std:skoscore</span>.</p>
648  </div>  </div>
649    
650  </div> <!-- section SKOS-based vocabularies -->  </div>
   
   
   
   
   
   
   
651    
652    
653  <div class="section">  <div class="section">

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