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Re: Property Path Profiles

From: Ivan Herman <ivan@w3.org>
Date: Mon, 11 Jan 2010 20:03:07 +0100
Message-ID: <4B4B75EB.4050902@w3.org>
To: matthew.perry@oracle.com
CC: W3C SPARQL Working Group <public-rdf-dawg@w3.org>
Matt,

to make things more understandable (for me:-) can you summarize what are
the features in the current property path document[1] that are _not_
covered? Ie, what do we give up if we use such profile(s)?

Thanks for your help

Ivan

[1] http://www.w3.org/2009/sparql/docs/property-paths/Overview.xml

On 2010-1-11 19:25 , Matt Perry wrote:
> Hi,
> 
> During the last TC, I mentioned the possibility of a Property Paths
> profile that identifies a subset of property path queries that can be
> expressed with SQL. Such a profile would make it easy for triple stores
> implemented on top of relational databases to identify the set of
> property path queries that they "natively" support.  The purpose of this
> email is to start a discussion about the possibility of property path
> profiles.
> 
> The grammars below show two possible fragments that we have identified.
> The first grammar is for SQL + CONNECT BY (Oracle) and the second is for
> PLAIN SQL.
> 
> CONNECT BY:
> 
> ALT  -> URI | URI|ALT
> SEQ  -> URI | URI/SEQ
> Elem -> URI | SEQ   | ALT   | ^URI
> COMP -> URI | Elem* | Elem+ | Elem{n,m} | Elem?
> TOP  -> URI | COMP  | ALT   | SEQ       | ^URI
> 
> PLAIN SQL:
> 
> ALT  -> URI | URI|ALT
> SEQ  -> URI | URI/SEQ
> Elem -> URI | SEQ       | ALT   | ^URI
> COMP -> URI | Elem{n,m} | Elem?
> TOP  -> URI | COMP      | ALT   | SEQ   | ^URI
> 
> Thanks,
> Matt
> 
> 
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
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Received on Monday, 11 January 2010 19:02:29 GMT

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