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Re: SPARQL Update feature

From: Alexandre Passant <alexandre.passant@deri.org>
Date: Tue, 13 Jul 2010 15:10:32 +0100
Cc: Steve Harris <steve.harris@garlik.com>, SPARQL Working Group <public-rdf-dawg@w3.org>
Message-Id: <809E5D46-5291-4C3D-96E7-E32504FB09C2@deri.org>
To: Andy Seaborne <andy.seaborne@talis.com>

On 13 Jul 2010, at 15:02, Andy Seaborne wrote:

> 
> 
> On 13/07/2010 2:54 PM, Steve Harris wrote:
>> On 2010-07-13, at 14:33, Andy Seaborne wrote:
>> 
>> [snip]
>> 
>>>>>>>>  Hence, DROP ALL will DROP all graphs, and the system MUST re-create the default one (as an empty graph).
>>>>>>>> 
>>>>>>>>  That would lead to
>>>>>>>> 
>>>>>>>>  DROP [ SILENT ] GRAPH<uri>
>>>>>>>> 
>>>>>>>>  =>
>>>>>>>> 
>>>>>>>>  DROP [ SILENT ] (GRAPH (<uri>    | DEFAULT) | ALL)
>>>>>>>> 
>>>>>>>>  (and DROP GRAPH DEFAULT == CLEAR GRAPH DEFAULT with the previous auto. default-graph creation feature)
>>>>>>>> 
>>>>>>>>  Makes sense ?
>>>>>> 
>>>>>>  I don't have an opinion whether DROPping the default should be allowed but if it is, meaning "clear" by implicit restoration is OK.
>>>> Ok - so based on that and your previous comments re. GRAPH DEFAULT, that could be
>>>> 
>>>> DROP [ SILENT ] (GRAPH<uri>   | DEFAULT | ALL)
>>>> 
>>>> and
>>>> 
>>>> CLEAR [ SILENT ] (GRAPH<uri>   | DEFAULT | ALL)
>>> 
>>> SILENT?  Isn't that only DROP and CREATE?
>> 
>> DROP GRAPH<a>
>> DROP GRAPH<a>
>> 
>> gives one or two errors, but
>> 
>> DROP SILENT GRAPH<a>
>> DROP SILENT GRAPH<a>
> 
> The grammar suggestion has
> 
> CLEAR SILENT GRAPH <a>
> 
> My question is how can CLEAR be silent (or not silent).
> 
> Is it CLEAR SILENT <a> for non-existent <a>?

That's what I have in mind.
If the GRAPH does not exist, SILENT is used in a similar way that with DROP, i.e. avoid raising error

Alex.

> 
> 	Andy
>> 
>> gives none. At least if it follows the SQL defn. of SILENT.
>> 
>> - Steve
>> 

--
Dr. Alexandre Passant
Digital Enterprise Research Institute
National University of Ireland, Galway
:me owl:sameAs <http://apassant.net/alex> .
Received on Tuesday, 13 July 2010 14:11:07 GMT

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