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Re: Shapes Constraint Language (SHACL) Working Draft of 2017-02-02

From: Irene Polikoff <irene@topquadrant.com>
Date: Wed, 8 Feb 2017 13:22:01 -0500
Cc: "<public-rdf-shapes@w3.org>" <public-rdf-shapes@w3.org>
Message-Id: <EEE04D96-62B0-4A86-9360-579DDDC0234A@topquadrant.com>
To: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>
I originally searched for *$shapesGraph* only. I now see the sentence you are referring to.

Irrespective, I believe the spec currently doesn’t have any tensions. It is consistently clear throughout that the support for this variable is optional and not a requirement for conformance.


> On Feb 8, 2017, at 12:25 PM, Peter F. Patel-Schneider <pfpschneider@gmail.com> wrote:
> Both the current editors' draft and the current working draft still include
> SHACL-SPARQL processors MAY pre-bind the variable shapesGraph to provide
> access to the shapes graph.
> Please try to carefully examine the document before replying.
> peter
> On 02/07/2017 10:02 PM, Irene Polikoff wrote:
>> Peter,
>> The word MAY was not used to talk about this variable in the published draft.
>> Having said this, I think the tension you are describing may have to do with
>> the fact that section 5.3.1 talks about $shapesGraph and $currentShape as
>> optional *if supported*, while sections 5.3 and 6.3 that refer to it said that
>> these variables MUST be used.
>> Please see modified language for sections 5.3 and 6.3 in the latest editor’s
>> draft. Does this clarify the topic in your view?
>> Regards,
>> Irene Polikoff
>>> On Feb 7, 2017, at 6:18 PM, Peter F. Patel-Schneider <pfpschneider@gmail.com
>>> <mailto:pfpschneider@gmail.com>> wrote:
>>>>> * $shapesGraph
>>>>> The status of $shapesGraph is unclear:
>>>>> "SPARQL variables using the $ marker represent external values that must be
>>>>> pre-bound or substituted in the SPARQL query before execution."
>>>>> "SHACL validation engines MAY pre-bind the variable $shapesGraph to provide
>>>>> access to the shapes graph.”
>>>> RESPONSE: Please clarify the issue. What is unclear?
>>> The first sentence says that $-marked variables must be pre-bound or
>>> substituted.  The second contracts that by using may.  The wording here has
>>> changed somewhat, but it is still a tension between the two wordings.
Received on Wednesday, 8 February 2017 18:22:57 UTC

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