- From: Ivan Herman <ivan@w3.org>
- Date: Mon, 11 Jan 2010 20:03:07 +0100
- To: matthew.perry@oracle.com
- CC: W3C SPARQL Working Group <public-rdf-dawg@w3.org>
- Message-ID: <4B4B75EB.4050902@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 Home: http://www.w3.org/People/Ivan/ mobile: +31-641044153 PGP Key: http://www.ivan-herman.net/pgpkey.html FOAF : http://www.ivan-herman.net/foaf.rdf vCard : http://www.ivan-herman.net/HermanIvan.vcf
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Received on Monday, 11 January 2010 19:02:29 UTC