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Re: ISSUE-54: Do we need (descriptions of) property functions in SD? Is this in scope for us?

From: Steve Harris <steve.harris@garlik.com>
Date: Tue, 16 Feb 2010 17:28:19 +0000
Cc: Paul Gearon <gearon@ieee.org>, SPARQL Working Group WG <public-rdf-dawg@w3.org>
Message-Id: <C5E697C9-43B6-4B4B-95DC-F2755C140E9A@garlik.com>
To: Lee Feigenbaum <lee@thefigtrees.net>
On 16 Feb 2010, at 17:23, Lee Feigenbaum wrote:

> On 2/16/2010 11:52 AM, Paul Gearon wrote:
>> On Tue, Feb 16, 2010 at 10:24 AM, SPARQL Working Group Issue Tracker
>> <sysbot+tracker@w3.org>  wrote:
>>> ISSUE-54: Do we need (descriptions of) property functions in SD?  
>>> Is this in scope for us?
>>> http://www.w3.org/2009/sparql/track/issues/54
>> I believe that we want this.
>> The scope of what property functions are capable of is essentially
>> unrestricted, so I don't think it's possible to really describe what
>> these functions do. However, it should be possible to obtain a list  
>> of
>> properties that fall into this category. As a user I would find that
>> useful in two ways:
>> 1. I'd know that using this property in a query, or getting it back  
>> in
>> a result involves entailed data, and not just extensional data.
>> 2. If I happen to recognize a property from the list, I will know  
>> that
>> a particular feature will be available to me.
> I'd be surprised if anyone disagrees that this is useful.
> However, I have no idea how we would specify it in the service  
> description document. How would we define a property/class that  
> describes something that is not itself defined anywhere? The only  
> way I see to do it is to define what a property function is, and  
> that's beyond our scope.

Right, this is my feeling too.

- Steve

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Received on Tuesday, 16 February 2010 17:28:48 UTC

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