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[re-send] Re: XSLT: status of owls:Documentation unclear

From: Masahiro Hori <HORIM@jp.ibm.com>
Date: Fri, 24 Jan 2003 23:18:50 +0900
To: Jerome.Euzenat@inrialpes.fr (Jerome Euzenat)
Cc: www-webont-wg@w3.org
Message-ID: <OFAC06EEEF.E40145E5-ON49256CB8.004CD2B4@LocalDomain>


# The previous reply was send erroneously due to my miss-operation.
# So, please discard the previous one, and take this reply.  Sorry...

'owls:Documentation' is used in a sloppy manner in the
XML presentation syntax Schema, and should be elaborated
in the specification ('owls' here indicates a namespace
prefix for the presentation syntax Schema).

The following idea would make the XSLT transformation
simpler and more consistent w.r.t. the Abstract Syntax.

---------------------------------------------------
(1) owls:Documentation for rdfs:comment

Basically, I assume 'owls:Documentation' is transformed
to 'rdfs:comment'.  The current Schema allows multiple
'owls:Documentation' under 'owls:Annotation'.

 <owls:Annotation>
   <owls:Documentation>This is the first comment.</owls:Documentation>
   <owls:Documentation>This is the second comment.</owls:Documentation>
   <owls:Documentation>This is the third comment.</owls:Documentation>
 </owls:Annotation>
==>
<rdfs:comment>This is the first comment.</rdfs:comment>
<rdfs:comment>This is the second comment.</rdfs:comment>
<rdfs:comment>This is the third comment.</rdfs:comment>


>> So, what should I do with:
>>    <owls:Documentation>
>>      <owl:subClassOf rdf:resource="#whatever"/>
>>    </owls:Documentation>
>> =?=>
>>    <owl:subClassOf rdf:resource="#whatever" />

If we take the following ideas as well, the above
example would be:

    <owls:Documentation>
      <owl:subClassOf rdf:resource="#whatever"/>
    </owls:Documenation>
   ==>
    <rdfs:comment>
      <owl:subClassOf rdf:resource="#whatever"/>
    </rdfs:comment>

Although I am not so sure if this result does not
cause any problem in RDF/XML, the idea here is that
owls:Documentation is like a CDATA sectiono in DTD.


---------------------------------------------------
(2) owls:Label (new!) for rdfs:label

For 'rdfs:label', it would be better to introduce 'owls:Label'
that can be added as children of owls:Annotation

 <owls:Annotation>
   <owls:Label>English name</owls:Label>
   <owls:Label>French name</owls:Label>
   <owls:Label>Italian name</owls:Label>
 </owls:Annotation>

owls:Annotation can only be specified as the first
element of the following elements:
  + owls:Individual
  + owls:Class (as an axiom)
  + owls:DatatypeProperty
  + owls:ObjectProperty
  + owls:EnumeratedClass

This limitation is in accordance with the Abstract
Syntax.  So, owls:Label can actually be used as
labels of those constructs as expected in RDFS.


---------------------------------------------------
(3) Dublin Core Metadata under 'owls:Head' (new)

Currently approach (include DC metadata into children
of owls:Documentation, which allows ANY child elements)
is a sloppy way of specifying the DC metadata.

 ###Current###
   <owls:Documentation>
     <dc:title>OWL Web Ontology Language</dc:title>
     <dc:creator>W3C Web Ontology (WebOnt) Working Group</dc:creator>
       ...
   </owls:Documentation>


I will fix this neatly by importing (in the XML Schema
sense) the DC metadata Schema [1] into the presentation
syntax Schema.

[1] http://dublincore.org/schemas/xmls/

In addition, I would like to propose to intorduce
'owls:Head' element that allows explicit inidication
of header section in the OWL document with XML
presentation syntax.  In RDF/XML, 'owl:ontology'
actually plays that role, but Metadata elements,
versioning elements (e.g., owls:VersionInfo,
owls:PriorVersion), and owls:import can be specified
in arbitrary position in the XML presentation syntax.

Taking the above two change (DC Schema & owls:Head),
the header section of OWL document will look like:

###Reviesed###
  <owls:Ontology>
    <owls:Head>
      <owls:VersionInfo>This is a revised version</owls:VersionInfo>
      <dc:title>OWL Web Ontology Language</dc:title>
      <dc:creator>W3C Web Ontology (WebOnt) Working Group</dc:creator>
       ...
      <owls:Import ontology="http://example.org/aaa.xml" />
      <owls:Import ontology="http://example.org/bbb.xml" />
    </owls:Head>

    <owls:Class name="..."> ... </owls:Class>
    ...

  </owls:Ontology>



-Masahiro

Masahiro Hori, Ph.D.
Group Leader, Programming Models & Tools,
IBM Tokyo Research Laboratory
Tel: +81-46-215-4667 / Fax: +81-46-274-4282
Email: horim@jp.ibm.com


                                                                                                                  
                      Jerome.Euzenat@in                                                                           
                      rialpes.fr               To:       www-webont-wg@w3.org                                     
                      (Jerome Euzenat)         cc:       Masahiro Hori/Japan/IBM@IBMJP                            
                      Sent by:                 Subject:  XSLT: status of owls:Documentation unclear               
                      www-webont-wg-req                                                                           
                      uest@w3.org                                                                                 
                                                                                                                  
                                                                                                                  
                      2003/01/24 06:44                                                                            
                                                                                                                  
                                                                                                                  




Hi,

             I am now tracking the differences between what my stylesheet
gives and what Masahiro expected when building the examples. There is
something disturbing with owls:Documentation. Here are the 3 examples
I have:

   <owls:Documentation>An example OWL ontology</owls:Documentation>
==>
<rdfs:comment>An example OWL ontology</rdfs:comment>

   <owls:Documentation>
     <dc:title>OWL Web Ontology Language</dc:title>
     <dc:creator>W3C Web Ontology (WebOnt) Working Group</dc:creator>
     <dc:subject>OWL; Web Ontology Language; Semantic Web</dc:subject>
     <dc:description>
       Classes and properties for the OWL Web Ontology Language
     </dc:description>
     <dc:publisher>W3C</dc:publisher>
     <dc:date>2003-01-15</dc:date>
     <dc:format>text/xml</dc:format>
     <dc:language>en</dc:language>
     <dc:identifier>http://www.w3.org/2002/07/owl</dc:identifier>
   </owls:Documentation>
==>
<dc:title>OWL Web Ontology Language</dc:title>
<dc:creator>W3C Web Ontology (WebOnt) Working Group</dc:creator>
<dc:subject>OWL; Web Ontology Language; Semantic Web</dc:subject>
<dc:description>
   Classes and properties for the OWL Web Ontology Language
</dc:description>
<dc:publisher>W3C</dc:publisher>
<dc:date>2003-01-15</dc:date>
<dc:format>text/xml</dc:format>
<dc:language>en</dc:language>
<dc:identifier>http://www.w3.org/2002/07/owl</dc:identifier>

   <owls:Documentation>
     <rdfs:label>Wine Ontology</rdfs:label>
   </owls:Documentation>
==>
<rdfs:label>Wine Ontology</rdfs:label>

 From this I infer the following mapping rule:

If the content of the documentation is text, then wrap it into
<rdfs:comment>
Otherwise, copy it verbatim...

So, what should I do with:
   <owls:Documentation>
     <owl:subClassOf rdf:resource="#whatever"/>
   </owls:Documentation>
=?=>
   <owl:subClassOf rdf:resource="#whatever" />

???


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Received on Friday, 24 January 2003 09:18:56 GMT

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