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Re: use a QName as variable identifier

From: Alberto Reggiori <alberto@asemantics.com>
Date: Mon, 1 Nov 2004 14:59:40 +0100
Message-Id: <4606EC54-2C0E-11D9-90D4-0011242E4018@asemantics.com>
Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>
To: Alberto Reggiori <alberto@asemantics.com>

small cut/paste mistake...

On Nov 1, 2004, at 2:51 PM, Alberto Reggiori wrote:

>
>
> hi all,
>
> while implementing the newer XML format to serialize query results  
> proposed by Dave Beckett
>
> 	http://lists.w3.org/Archives/Public/public-rdf-dawg/2004JulSep/ 
> 0565.html
>
> it came to my mind a simple use-case where the user wants to prefix  
> each variable with a meaningful namespace
>
> PREFIX dc:  <http://foo.com/foo/>

this should be

PREFIX dc: <http://purl.org/dc/elements/1.1/>


> PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
> PREFIX my:  <http://foo.com/my/namespace/>
> SELECT ?my:name ?my:title
> FROM <file:foo6.rdf>
> WHERE
>    (?person rdf:type foaf:Person)
>    (?person foaf:name ?my:name)
>    (?person dc:title ?my:title)
>
> where foo6.rdf is
>
> <?xml version="1.0"?>
> <rdf:RDF
>    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>    xmlns:dc="http://purl.org/dc/elements/1.1/"
>    xmlns:foaf="http://xmlns.com/foaf/0.1/" >
>
> <foaf:Person foaf:name="Some Name" dc:title="Some Title" />
>
> </rdf:RDF>
>
> and use the PREFIX namespace into the XML serialization
>
> <?xml version="1.0"?>
> <results xmlns='http://www.w3.org/sw/2001/DataAccess/result1#'
>  xmlns:my='http://foo.com/my/namespace/' >
>    <result>
>          <my:name>Some Name</my:name>
>          <my:title>Some Title</my:title>
>    </result>
> </results>
>
> which would allow a kind of "lightweight" construct to map a input  
> namespace to an output one - CONSTRUCT clause would provide a more  
> general solution to the mapping/rules problem.
>
> The above query can be tested at  
> http://demo2.asemantics.com/rdfstore/rdql/
>
> In other words we could use QNAME in place of VAR terminal symbol...
>
> Any bigger implication on SPARQL grammar I did not think of?
>
> Alberto
>
>
> -
> Alberto Reggiori, Senior Partner, R&D @Semantics S.R.L.
> alberto@asemantics.com  www.asemantics.com
> Milan Office, milano@asemantics.com,   +39 0332 667092
>
>
-
Alberto Reggiori, Senior Partner, R&D @Semantics S.R.L.
alberto@asemantics.com  www.asemantics.com
Milan Office, milano@asemantics.com,   +39 0332 667092
Received on Monday, 1 November 2004 13:59:50 GMT

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