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Re: Collection / Grammar Issue

From: Alex Milowski <alex@milowski.com>
Date: Wed, 15 May 2013 20:02:05 -0700
Message-ID: <CABp3FNJV0HspWmjKa3WcPThu7D=heX_6FCkV4UrdUQGYfuK2AA@mail.gmail.com>
To: Sandro Hawke <sandro@w3.org>
Cc: Gavin Carothers <gavin@carothers.name>, "Eric Prud'hommeaux" <eric@w3.org>, "public-rdf-comments@w3.org" <public-rdf-comments@w3.org>
That would certainly work for me.  If this isn't a desired feature, and I'm
at a loss as to why it would be wanted, then no changes are needed to the
grammar.


On Wed, May 15, 2013 at 7:57 PM, Sandro Hawke <sandro@w3.org> wrote:

>  On 05/15/2013 10:44 PM, Gavin Carothers wrote:
>
> I have no idea. We're the ones who wrote the example Sandro ;) ... eric?
>
>
> Oh.   Then lets just fix the example, adding a ":a :b" in front of the
> list, yes?
>
>        - s
>
>
>   RDF collections can be nested and can involve other syntactic forms:
>
> @prefix : <http://example.org/stuff/1.0/> .
> (1 [:p :q] ( 2 ) ) .
>
> is syntactic sugar for:
>
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
>     _:b0  rdf:first  1 ;
>           rdf:rest   _:b1 .
>     _:b1  rdf:first  _:b2 .
>     _:b2  :p         :q .
>     _:b1  rdf:rest   _:b3 .
>     _:b3  rdf:first  _:b4 .
>     _:b4  rdf:first  2 ;
>           rdf:rest   rdf:nil .
>     _:b3  rdf:rest   rdf:nil .
>
>
>
>
> On Wed, May 15, 2013 at 7:34 PM, Sandro Hawke <sandro@w3.org> wrote:
>
>>  On 05/15/2013 07:41 PM, Alex Milowski wrote:
>>
>>  I ran across a problem while implementing a Turtle parser.
>>
>>  In section 3 of [1], the 7th example is:
>>
>>  @prefix : <http://example.org/stuff/1.0/> .
>> (1 [:p :q] ( 2 ) ) .
>>
>>
>>  (unofficial reply, trying to clarify)
>>
>> Why would you want a turtle file that's just a list?   How would you use
>> that?
>>
>>         -- Sandro
>>
>>
>>   The production for triples in section 6.5 is:
>>
>>  [6] triples ::= subject predicateObjectList | blankNodePropertyList
>> predicateObjectList?
>>  [7] predicateObjectList ::= verb objectList (';' (verb objectList)?)*
>>  [10] subject ::= iri | BlankNode | collection
>>
>>  According to these productions, the example is invalid.  The subject
>> reduces to the collection and must be followed by a verb.  Yet, the example
>> does not have a following predicate object list.
>>
>>  If this is truly suppose to be valid, I think the productions need to
>> be:
>>
>>     triples ::= subject predicateObjectList |
>>                         collection predicateObjectList? |
>>                         blankNodePropertyList predicateObjectList?
>>    subject ::= iri | BlankNode
>>
>>  BTW, it would be a wonderful editorial change to number the examples.
>>
>>  [1] http://www.w3.org/TR/2013/CR-turtle-20130219/
>>
>>  --
>> --Alex Milowski
>> "The excellence of grammar as a guide is proportional to the paucity of
>> the
>> inflexions, i.e. to the degree of analysis effected by the language
>> considered."
>>
>> Bertrand Russell in a footnote of Principles of Mathematics
>>
>>
>>
>
>


-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics
Received on Thursday, 16 May 2013 03:02:36 UTC

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