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Re: [TF-PP] Possible starting points

From: Lee Feigenbaum <lee@thefigtrees.net>
Date: Tue, 29 Sep 2009 11:34:14 -0400
Message-ID: <4AC228F6.20305@thefigtrees.net>
To: "Seaborne, Andy" <andy.seaborne@hp.com>
CC: SPARQL Working Group <public-rdf-dawg@w3.org>
Seaborne, Andy wrote:
> This is a request for your views on starting points for the property paths time permitting feature.  
> 
> Please send +1/0/-1 for the options (which aren't meant to be mutually exclusive) or we might get telcon time.
> 
> I've tried to list the main possibilities in terms of styles and approach as starting points: all have variations and areas of uncertainty (e.g. ordering of results).
>  
> 1/ Property paths only mention IRIs or prefixed names.
> 
> The most conservative choice. Still need to relate to entailment.
> 
> 2/ Property paths with variables and IRIs or prefixed names.
> (issues include restriction of what can be asked a la ?p* discussion)
> 
> 3/ With access to the length of the path matched
> Issues include how multiple paths between two nodes are handled (two lengths possible).
> 
> 4/ With access to the path matched (path-valued variables is one possibility)
> Issues as 3 + what is a path value "datatype".
> 
> For all of them: add an option to have
> 
> 5/ A mechanism that will allow a variety of path matching schemes, and provide one such system.
> Roughly, this would involve defining syntax so various different approaches can at least use common syntax but choose from 1-4 as to what the WG describes in this round of standardization and show the relationship to the syntax. E.g having a PATH keyword idea in [1].
> 
> Then
> 
> 6/ Do nothing in this round - too early to standardise.
> 
> 	Andy

I'm +1 on #1 and -1 on everything else: I'm afraid of the complexity of 
everything else, and think that doing #1 enables a whole range of uses. 
It also lays the (syntactical) groundwork for #2, at least, and I don't 
think it precludes systems that want to do something else for #3 and #4.

Lee

> 
> 
> http://www.w3.org/2009/sparql/wiki/TaskForce:PropertyPaths
> http://www.w3.org/2009/sparql/wiki/Feature:PropertyPaths
> 
> [1] http://lists.w3.org/Archives/Public/public-rdf-dawg/2009JulSep/0315.html
> 
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Received on Tuesday, 29 September 2009 15:35:01 GMT

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