Re: FW: [office] RDF Metadata Proposal: Association of OWL Classes andID'd Elements

[Svante Schubert <Svante.Schubert@Sun.COM>]

Hi Dennis,

please find my answers below.

Regards,
Svante

Dennis E. Hamilton wrote:
> I sent this from the wrong account and the list server won't take it.  Here it is again. 
>
> -----Original Message-----
> From: Dennis E. Hamilton (not OASIS-recognized e-mail address)
> Sent: Sunday, January 11, 2009 17:32
> To: 'Svante.Schubert@Sun.COM'; 'OASIS Office'
> Subject: RE: [office] RDF Metadata Proposal: Association of OWL Classes and ID'd Elements
>
> Svante,
>
> regarding my example,  
>
>   
>> 	<table:table-cell 
>>           xml:id="cellT1A1B732"
>>           xmlns:table="urn:oasis:names:tc:opendocument:xmlns:table:1.0"
>>           >
>>
>>     
>
> 1. I might have picked up the notation 
>
>     {urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-cell
>
> as the extended name for QName table:table-cell from the Java specification.  I though I had seen it used as a notation for extended names in XML but I don't see any use of it in the obvious places.  I must have picked it up for use with XML because it is so handy for writing extended names.
>   
>
> 2. The reason I used that form of extended name is to point out that the element QName might not be formable into a URI by concatenation.  I should have simply asked you if you literally meant concatenation.  I was not so sure that "urn:oasis:names:tc:opendocument:xmlns:table:1.0table-cell" would provide an appropriate owl:class attribute value and I thought concatenation might not have been the right term.
>   
Let me answer 1 and 2 in one:
The OWL class for the specific type of an ODF element is similar to the 
expanded element name, which the combination of the XML namespace and 
local-name (similar to the defined in 
http://www.w3.org/TR/xml-names11/#concepts )
It is always possible to create an URI with our namespaces, as it does 
not offend the restrictions given by 
http://www.rfc-editor.org/rfc/rfc4395.txt (like avoid improper use of 
"//", "." or ".." within an URI).
The brackets '{' and '}' seem to help a round-trip, but the prefix names 
would get lost. If someone intended to do a round-trip, he might as well 
save the prefix namespaces.
> 3. I do not need to see an elaborate example instead of the simple case above.  I just want to know the implicit OWL class name in the above example?  Is it literally the unadorned concatenation of the namespace URI and the local name?
>   
The OWL class URI  is 
urn:oasis:names:tc:opendocument:xmlns:table:1.0table-cell
> 4. And identification of the instance is somehow built up to a URI using the resource "content.xml#cellT1A1B732" ?
>   
Yes, it is the URL of the ODF document (base URL of the content.xml) 
combined with this relative resource URL "content.xml#cellT1A1B732".

Regards,
Svante
>  - Dennis
>
> -----Original Message-----
> From: Svante.Schubert@Sun.COM [mailto:Svante.Schubert@Sun.COM] 
> http://lists.oasis-open.org/archives/office/200901/msg00089.html
> Sent: Sunday, January 11, 2009 14:59
> To: 'OASIS Office'
> Subject: Re: [office] RDF Metadata Proposal: Association of OWL Classes and ID'd Elements
>
> Dennis,
>
> Please find some comments in the text.
>
> Dennis E. Hamilton schrieb:
> http://lists.oasis-open.org/archives/office/200901/msg00083.html
> [ ... ]
>   
>>   
>>     
> You are right, we might improve the wording here. I would even go a step
> further and suggest based on your approach the following:
>
> "In the RDF metadata, every XML element in an OpenDocument package
> stream that has a type ID attribute may be described using an OWL class,
> which URI is the concatenation of the element's XML Namespace IRI and
> the element's local name."
>
> to replace
>
> "Every OpenDocument XML element with an xml:id attribute is itself a OWL
> class identified by the concatenation of it's XML Namespace and it's XML
> local name."
>   
>> Example: In a content.xml package subfile containing an element tag
>>
>> 	<table:table-cell 
>>           xml:id="cellT1A1B732"
>>           xmlns:table="urn:oasis:names:tc:opendocument:xmlns:table:1.0"
>>           >
>>
>>    The OWL class is identified {urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-cell
>>    (in a common notation for concatenating namespace identifiers and local names).  The 
>>    instance of the member of that OWL class is identified by a URI path that ends at resource
>>    "content.xml#cellT1A1B732" 
>>   
>>     
> The common notion need some reference. I am only aware of this in an
> internal Java context and never found it in RDF files.
>   
>>    2.4 IS THIS CLOSE TO RIGHT?  I have no idea -- it is just my effort at making sense of the original statement making significance of the ID associated with the element.  I can imagine that it might be more apt to say that "The supported classes are defined as subclasses of odf:Element."
>>   
>>     
> [ ... ]
>
>
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>   

-- 
Sun Microsystems GmbH           Svante Schubert
Nagelsweg 55                    Software Engineer
20097 Hamburg                   StarOffice / OpenOffice.org Development
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http://www.sun.com              Svante.Schubert@sun.com

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