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As I work over DTB

From: Axel Polleres <axel.polleres@deri.org>
Date: Thu, 27 Mar 2008 17:45:24 +0000
Message-ID: <47EBDD34.5080508@deri.org>
To: "Public-Rif-Wg (E-mail)" <public-rif-wg@w3.org>

Dear all,

we still *only* have a subset of xpath/xqueryt functions and operators 
covered... basically the ones from the list of paula originally 
collected plus the casts and type checking functions added for the 
supported datatypes...

I was asking myself whether we shouldn't provide  at least some base 
built-ins for rdf:XMLLiteral and rif:text as well in sections?

For rif:text, I suggest:

rifBuiltinFunc:lang($literal) as xsd:string

Returns the language tag in lower case if in the current interpretation 
$literal is in the value space of rif:test and an error otherwise.

For stripping off the string part, we should define a Cast from
rif:text to xsd:string accordingly in section 2.3.2 Cast functions.


For rdf:XMLLiteral
the most useful would probably be Xpath or XQuery builtin functions
such as

rifBuiltinFunc:evalXPath($XMLLiteral, $XPath) as rdf:XMLLiteral

rifBuiltinFunc:evalXQuery($XMLLiteral, $XQuery) as rdf:XMLLiteral


which works for $XMLLiteral if in the current interpretation is in the 
value space of rdf:XMLLiteral and $XPath, $XQuery's interpretation is in 
the value space of xsd:string and representing valid Xpath expressions 
or XQuery FLWOR expressions...
  I am afraid though extremely useful, not everybody wants to implement 
full XPath/Xquery support in their engines...


opinions welcome whether I am allowed to include those! ;-)

Axel




-- 
Dr. Axel Polleres
email: axel@polleres.net  url: http://www.polleres.net/

rdfs:Resource owl:differentFrom xsd:anyURI .
Received on Thursday, 27 March 2008 17:46:07 GMT

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