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RE: CURIEs: A proposal

From: Misha Wolf <Misha.Wolf@reuters.com>
Date: Fri, 23 Jun 2006 20:42:25 +0100
To: public-rdf-in-xhtml-tf@w3.org, semantic-web@w3.org, www-tag@w3.org
Message-id: <A29ADE959C70A1449470AA9A212F5D80021E9B7C@LONSMSXM06.emea.ime.reuters.com>

I've updated this survey in the light of:
-  Noah Mendelsohn's mail
-  a conversation with Shane McCarron
-  a NewsML 2 Architecture WP discussion

The data points presented reflect my own, incomplete, understanding.
Please help by correcting the ones that are wrong and providing the 
missing (or additional) data points.

For context, see:
-  RDFa Primer 1.0, 16 May 2006
   http://www.w3.org/TR/2006/WD-xhtml-rdfa-primer-20060516/
-  News Taxonomies presentation to the W3C AC, given on 22 May 2006
   http://lists.w3.org/Archives/Public/www-archive/2006Jun/0013.html
-  CURIEs: A proposal, 2 June 2006
   http://lists.w3.org/Archives/Public/www-tag/2006Jun/0007.html

7   Each language must specify:

7a  the syntactic constraints (if any) on the prefix and suffix.

    XMLNS    : NCNAME
    XHTML    : prefix = any; suffix = IRI
    NewsML 2 : NCNameChar+
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7b  how CURIEs and URIs are distinguished, eg through dedicated 
    attributes or through a special syntax.

    XMLNS    : ?
    XHTML    : Mix of dedicated attributes and special syntax 
               ("[a:b]") for non-dedicated attributes
    NewsML 2 : Dedicated attributes
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7c  the mechanism for specifying the prefix-to-IRI mapping.  The 
    mechanism may use information provided out-of-band.

    XMLNS    : xmlns attribute
    XHTML    : xmlns attribute
    NewsML 2 : scheme element
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7d  whether and, if so, how the prefix and suffix are combined to 
    form an IRI.

    XMLNS    : Left to each language to specify
    XHTML    : Plain concatenation
    NewsML 2 : For vocabularies managed by the IPTC, we're 
               considering:
                 <vocabIRI> & "#_" & <code>
               or plain concatenation, coupled with vocabIRIs ending 
               with "?" or "/" or "#_" 
               For vocabularies not managed by the IPTC:
                 Left to each vocabulary authority to specify
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7e  whether the prefix and suffix form a tuple or whether they are 
    a compact representation for an IRI.

    XMLNS    : Tuple
    XHTML    : Compact representation for an IRI
    NewsML 2 : Tuple and compact representation for an IRI
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7f  whether the dereferencing of the IRI mapped to the prefix is 
    required to yield a useful and relevant information resource.

    XMLNS    : Not required, but the Architecture of the WWW states:
               "The owner of an XML namespace name SHOULD make 
               available material intended for people to read and 
               material optimized for software agents in order to 
               meet the needs of those who will use the namespace 
               vocabulary."
    XHTML    : Not required
    NewsML 2 : Required
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7g  whether the dereferencing of the IRI built from the prefix and 
    suffix (and, possibly, also other building blocks) is required 
    to yield a useful and relevant information resource.

    XMLNS    : Left to each language to specify
    XHTML    : Yes
    NewsML 2 : For vocabularies managed by the IPTC: MUST
               For vocabularies not managed by the IPTC: SHOULD
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

7h  whether any fragment identifiers in these IRIs are required to 
    be legal XML names.

    XMLNS    : Outside the scope of the spec
    XHTML    : Outside the scope of the spec
    NewsML 2 : Yes
    SPARQL   : ?
    RDF/XML  : ?
    N3       : ?
    Turtle   : ?

Misha
------------------- NewsML 2 resources ------------------------------
http://www.iptc.org         | http://www.iptc.org/std-dev/NAR/1.0
http://www.iptc.org/std-dev | http://groups.yahoo.com/group/newsml-2


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Received on Friday, 23 June 2006 19:53:15 GMT

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