W3C home > Mailing lists > Public > www-rdf-interest@w3.org > May 2001

RE: RDF and xml:base

From: Lee Jonas <lee.jonas@cakehouse.co.uk>
Date: Wed, 30 May 2001 15:05:26 +0100
Message-ID: <51ED29F31E20D411AAFD00105A4CD7A7712B@ZINGIBER>
To: "'Graham Klyne'" <GK@NineByNine.org>
Cc: RDF Interest <www-rdf-interest@w3.org>
Graham Klyne [mailto:GK@NineByNine.org] wrote:

>This discussion seems to be getting hung-up on possibly side issues.

Quoting supporting material to put my point across is hardly a side issue
;-).

>Can I, or can I not do this:
>
>   <rdf:RDF xmlns:rdf='...' xmlns:ex='http://example.org/'
>            xml:base='http://example.org/Base/' >
>     <rdf:Description rdf:ID='localID'>
>       <ex:property>PropVal</ex:property>
>     </rdf:Description>
>   </rdf:RDF>
>
>?

Yes you can.

>And if I can, what is the full URI of the resource identified locally as 
>'localID'.
>
>I have encountered a requirement to use this general form, or something 
>like it, to assign a full URI to this resource.  My expectation was that 
>xml:base used as above would provide for it to be defined as 
>'http://example.org/Base/#localID'.

No, I believe this is not correct.  If the document's URI were, say,
'http://other.com/doc.html' then localID's absolute URI-reference would be
'http://other.com/doc.html#localID'.

To get the behaviour you want would it would have to be something like:

   <rdf:RDF xmlns:rdf='...' xmlns:ex='http://example.org/'
            xml:base='http://example.org/Base/' >
     <rdf:Description rdf:about='./#localID'>
       <ex:property>PropVal</ex:property>
     </rdf:Description>
   </rdf:RDF>

then the relative URI './' gets resolved to 'http://example.org/Base/' as
specified by the xml:base attribute.  This is not quite what you are trying
to specify, but if you think it through, it makes sense: you cannot define
local RDFResources for other documents, they are local to the current
document.  

However, in your favour RDF does not require there to be a resource at
http://example.org/Base/ in order to talk about parts of it and assume there
are RDFResources defined within it - so using 'rdf:about' should be ok.

In summary, xml:base would only be useful in RDF for resolving any relative
URIs specified within attributes like 'rdf:about', 'rdf:resource', etc (not
rdf:ID).

regards

Lee

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end
Received on Wednesday, 30 May 2001 10:05:08 GMT

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