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Re: On the inevitability of SPARQL/SPIN for SHAQL

From: Jose Emilio Labra Gayo <jelabra@gmail.com>
Date: Tue, 3 Mar 2015 06:30:30 +0100
Message-ID: <CAJadXXLfrfhiR-mV0uo9vnAeJPqOZ=XSd_LOLV_rUHBCaBWH6w@mail.gmail.com>
To: Holger Knublauch <holger@topquadrant.com>
Cc: RDF Data Shapes Working Group <public-data-shapes-wg@w3.org>
On Tue, Mar 3, 2015 at 6:11 AM, Holger Knublauch <holger@topquadrant.com>

>  On 3/3/2015 14:59, Jose Emilio Labra Gayo wrote:
>> Why should this group take on such undertaking instead of reusing already
>> existing language produced by W3C?
>  Because "SPARQL queries cannot easily be inspected and understood,
> either by human beings or by machines, to uncover the constraints that are
> to be respected". [1]
> Jose, the sentence following your excerpt above is
> "The term 'shape' emerged as a popular label for these constraints."
> I believe this clarifies that the group was not contrasting SPARQL with
> something like XPath,

Not at all...why do you say that?

I think I have already clarified what subset of XPath I was talking about
and for what purpose.

> but rather SPARQL versus the high-level vocabulary of sh:minCount and
> sh:valueType. A new language such as a yet-to-be-defined variant of XPath
> or a yet-to-be-defined subset of SPARQL's FILTER expressions would arguably
> have the same basic characteristics as SPARQL itself.

No, because that subset of XPath (or SPARQL expressions as Richard said)
can be used for built-in functions and operations and has a much simpler
semantics that we can leverage on than the full SPARQL language with BGPs,

Best regards, Jose Labra

> Holger

-- Jose Labra
Received on Tuesday, 3 March 2015 05:31:18 UTC

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