As Stefano said, SPARQL could be sufficient for the graph->tree
projection, but only in very specific and thus limited cases. Besides,
SPARQL is only one of three selector languages available in Fresnel. You
have a basic selector language based on names, which is a subset of the
second language, called FSL (Fresnel Selector Language [1]), and then
you have SPARQL. Considering this, it might not be straightforward (or
desirable) to reuse the SPARQL result format, unless it brings us something.
[1]
http://simile.mit.edu/repository/fresnel/trunk/docs/manual/fsl.html
conor dowling wrote:
> this may be way off base - I'm only getting up to speed on RDF querying.
> Is there any reason why the Fresnel "Result Tree" can't just be an
> enhanced version of the SPARQL query result format
> (http://www.w3.org/2001/sw/DataAccess/rf1/). For example, just add a
> label attribute to head elements to support labels?
>
> In the SPARQL standard they say: ""Results can be thought of as a table,
> with one row per query solution. Some cells may be empty because a
> variable is not bound in that particular solution."
>
> An example in the SPARQL standard
> (http://www.w3.org/TR/2005/WD-rdf-sparql-query-20050419/#select) with
> added label support?
>
> <?xml version="1.0"?>
> <sparql
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
> xmlns="http://www.w3.org/2001/sw/DataAccess/rf1/result" >
> <head>
> <variable name="nameX" label="Name"/> <!-- ADDED label here -->
> <variable name="nameY" label="Friends Name"/>
> <variable name="nickY" label="NickName"/>
> </head>
> <results>
> <result>
> <nameX>Alice</nameX>
> <nameY>Clare</nameY>
> <nickY>CT</nickY>
> </result>
> <result>
> <nameX>Alice</nameX>
> <nameY>Bob</nameY>
> <nickY bound="false"/>
> </result>
> </results>
> </sparql>
--
Emmanuel Pietriga
INRIA Futurs - Projet In Situ tel : +33 1 69 15 34 66
Bat 490, Université Paris-Sud fax : +33 1 69 15 65 86
91405 ORSAY Cedex http://www.lri.fr/~pietriga
Received on Mon May 09 2005 - 05:29:52 EDT