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RE: New Version of Networked Graphs Sail Available

From: Michael Schneider <schneid@fzi.de>
Date: Thu, 18 Oct 2007 09:42:43 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A04A84BB@judith.fzi.de>
To: "Simon Schenk" <sschenk@uni-koblenz.de>
Cc: "Sesame Developer discussion list" <sesame-devel@lists.sourceforge.net>, "semantic-web" <semantic-web@w3.org>

Hi, Simon!

Simon Schenk wrote:

>Networked Graphs are an extension of named graphs, which allow 
>to define
>a graph both extensionally by listing triples (as in named graphs), but
>also intensionally through views. Views are expressed using SPARQL
>queries and are included into graphs using a simple RDF syntax. To
>express that some graph G should contain the results of a query Q, we
>simply add a statement (G ng:definedBy Q^^ng:Query) to G. Views can use
>negation as failure, just as normal SPARQL queries and can recursively
>depend on each other. The reasoning engine will resolve this recursion.
>A graph can at the same time contain intensionally and extensionally
>defined statements. 

To see if I correctly understand this idea: Am I allowed to do the following
graph specification:

    G { s p o . }
    G ng:definedBy Q1^^ng:Query .
    G ng:definedBy Q2^^ng:Query .

? And does this mean that G is the UNION of

    * the explicitly defined statement set { s p o . }
    * the result set of Q1
    * the result set of Q2

?

Cheers,
Michael 

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Email: Michael.Schneider@fzi.de
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Received on Thursday, 18 October 2007 07:42:56 GMT

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