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Re: Last Call comment on SPARQL 1.1 Update

From: Michael Hausenblas <michael.hausenblas@deri.org>
Date: Mon, 13 Jun 2011 15:03:25 +0100
Cc: W3C SPARQL WG comments <public-rdf-dawg-comments@w3.org>
Message-Id: <439B2E13-945D-4A43-85EE-19F0FE86C69A@deri.org>
To: Lee Feigenbaum <lee@thefigtrees.net>

Lee,


> We would be grateful if you would acknowledge that your comments  
> have been answered by sending a reply to this mailing list.


Yes. Thanks.

Cheers,
	Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 13 Jun 2011, at 15:02, Lee Feigenbaum wrote:

> Hi Michael,
>
> Thanks for your comments on the SPARQL 1.1 Update Last Call draft.
>
> While the Working Group has considered existing implementation  
> experience and the implement-ability of the update language in  
> defining the update specification, the group is not inclined to  
> discuss specific implementation strategies within the document. The  
> SPARQL 1.1 Update language is designed to be used to update data  
> within RDF graph stores, and the Working Group has identified many  
> application scenarios that require the ability to delete data (in  
> addition to inserting new data or doing both at once). The group  
> agrees that updating large amounts of data may be time-consuming  
> against very large data sets, but feels that implementation  
> techniques to address this are beyond the scope of our charter and  
> this specification. Please note that it is not unusual for query or  
> update languages to give application the ability to execute  
> operations that are very time consuming under certain conditions.
>
> The Working Group intends to advance this specification to W3C  
> Candidate Recommendation status and to call for implementations of  
> the language, along with any experiences related to implementing the  
> language that might be cause for concern in the design of the  
> language. As you use and/or implement the update language, we'd of  
> course welcome any feedback you have if there are parts of the  
> language design that might change to address your concerns over  
> large-scale deployments.
>
> We would be grateful if you would acknowledge that your comments  
> have been answered by sending a reply to this mailing list.
>
> thanks,
> Lee
> On behalf of the SPARQL Working Group
>
> On 5/29/2011 12:29 PM, Michael Hausenblas wrote:
>>
>> All,
>>
>> This is a comment concerning the Last Call Working Draft 'SPARQL 1.1
>> Update' [1]. It is clearly written and, AFAICT sound. However, I  
>> have an
>> issue with it - more on the conceptual level. I tried to express my
>> concerns in a blog post [2] and will do my best to summarise in the
>> following.
>>
>> While the proposed update language - without any doubt - is perfectly
>> suitable for 'small to medium'-sized setups, I fear that we will run
>> into troubles in large-scale deployments concerning the costs for
>> updating and deleting huge volumes of triples. Now, I wish I had
>> experimental evidence myself to proof this (and I have to admit I  
>> don't
>> have), but I would like the WG to consider to either include a  
>> section
>> discussing the issue, or setting up a (non-REC Track) document that
>> discusses this (which could be titled 'implementation/usage advices  
>> for
>> large-scale deployments' or the like). I do feel strongly about  
>> this and
>> would offer to contribute to such a document, if desired.
>>
>> I'd very much appreciate it if WG members would be able to point me  
>> to
>> own experiences in this field (experiments or real-world deployments
>> alike).
>>
>> Cheers,
>> Michael (with my DERI AC Rep and RDB2RDF WG co-chair hat off)
>>
>> [1] http://www.w3.org/TR/2011/WD-sparql11-update-20110512/
>> [2] http://webofdata.wordpress.com/2011/05/29/ye-shall-not-delete-data/
>>
>> --
>> Dr. Michael Hausenblas, Research Fellow
>> LiDRC - Linked Data Research Centre
>> DERI - Digital Enterprise Research Institute
>> NUIG - National University of Ireland, Galway
>> Ireland, Europe
>> Tel. +353 91 495730
>> http://linkeddata.deri.ie/
>> http://sw-app.org/about.html
>>
>>
>>
Received on Monday, 13 June 2011 14:04:05 GMT

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