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Re: Inline data

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Tue, 01 May 2012 09:10:52 +0100
Message-ID: <4F9F9A8C.4050802@epimorphics.com>
To: public-rdf-dawg@w3.org


On 30/04/12 18:02, Steve Harris wrote:
> On 30 Apr 2012, at 13:27, Andy Seaborne wrote:
>
>>
>>
>> On 30/04/12 13:12, Eric Prud'hommeaux wrote:
>>
>>> This seems like a balance between consistency and convenience. It's
>>> grammatically distinguishable in LL/LALR(1) with this patch:
>>>
>>> -[29]  DataBlock  ::=      Var*     '{' ( '(' DataBlockValue* ')' | NIL )* '}'
>>> +[29]  DataBlock  ::=  '(' Var* ')' '{' ( '(' DataBlockValue* ')' | NIL )* '}'
>>>                      |      Var      '{'       DataBlockValue*              '}'
>>>
>>> IMO, it actually adds some consistency by sticking parens around the
>>> var list.
>>
>>
>> Rest assured that the worked example is also a working example!  I added the feature as an extension to ARQ and it parses OK (including for the GraphPatternNotTriples which is the more senstive-to-change area).
>>
>> (Speculative thoughts from here)
>>
>>> One problem with "DATA" is that SPARQL's data is RDF triples, not
>>> variable bindings. Practically, we may some day want to add premises
>>> like:
>>
>> Using the FROM clause would seem good here:
>>
>>>     DATA { :Fido a :Dog }
>>>     SELECT ?mammal { ?mammal a :Mammal }
>>
>> SELECT ?mammal { ?mammal a :Mammal }
>> FROM DATA { :Fido a :Dog }
>>
>> or
>>
>> SELECT ?mammal { ?mammal a :Mammal }
>> FROM { :Fido a :Dog }
>
> I agree with Eric, I think DATA is a bad choice of word here.
>
> I prefer BINDINGS to DATA - BINDINGS is more similar to BIND () than it is to DATA {  }, which should help people trying to learn.
>
> If we want to avoid strings starting lexically with BIND, then maybe VALUES?  la SQL.

VALUES works for me.

Just for completeness, we could use syntax and
splash out [*] on new delimiter tokens e.g. "{|" "|}"

{| ?x  <a> <b> <c> |}

{| (?x ?y)
    (<a> 123)
    (<b> 456)
    (<c> 789)
|}

	Andy

[*] Sorry about that - to say it's raining here at the moment is 
understatement.

>
> - Steve
>
Received on Tuesday, 1 May 2012 08:11:21 GMT

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