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Re: "How Many ..."

From: Tom Adams <tom@tucanatech.com>
Date: Tue, 15 Jun 2004 21:42:47 -0400
Message-Id: <78212E80-BF36-11D8-8174-000A95C9112A@tucanatech.com>
Cc: Bjoern Hoehrmann <derhoermi@gmx.net>
To: public-rdf-dawg-comments@w3.org

Hi Bjoern,

> <snip/>
>   Regarding <http://www.w3.org/TR/rdf-dawg-uc/>, I would like to  
> suggest
> a requirement that a query language provides a simple means to access
> answers to "how many" questions. It is common for user interfaces to
> provide such information as summary along with the information or as a
> preview for the actual data.
> <snip/>

Thanks for your comments on the working group's use case document.

I assume from the comments in your message, that you are talking about  
performing an aggregate function on the results of a query? This  
feature is implemented in several current RDF query languages, see for  
example the following links:

iTQL: http://www.kowari.org/docs/itql.php#count
RDFQL:  
http://www.intellidimension.com/default.rsp?topic=/pages/rdfgateway/ 
reference/db/select.rsp
RQL: http://www2002.org/CDROM/refereed/329/
RDF Query: http://www1.coe.neu.edu/~srayavar/W3CQL/ql.htm
Versa:  
http://www.aifb.uni-karlsruhe.de/WBS/pha/rdf-query/queries/versa/ 
Counting.versa

> I would generally like to do the same thing with similar complexity
> using RDF data sources, but I am not sure how much of this is in scope
> of the the Data Access WG...

This is an ongoing discussion, one that I personally expect to be dealt  
with by the group in due course. It's certainly an area that I see as  
being important, and one that I feel is better handled at the store  
level than the application level.

Please review the notes from the 15 July 2004 teleconference for more  
details on the group's current thinking, a link will be posted to  
public-rdf-dawg when they become available.

Cheers,
Tom
-- 
Tom Adams           | Tucana Technologies, Inc.
Support Engineer    |   Office: +1 703 871 5313
tom@tucanatech.com  |     Cell: +1 571 594 0847
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Received on Tuesday, 15 June 2004 21:42:51 GMT

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