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Re: Fixing error in Turtle and Trig grammars

From: Paul Gearon <gearon@ieee.org>
Date: Wed, 12 Feb 2014 19:54:24 -0500
Message-ID: <CAGZNPFmEJoSrcBmPsQSN+wsTt84-zS6b=42nA6wDmYB=H3iT0w@mail.gmail.com>
To: "Eric Prud'hommeaux" <eric@w3.org>
Cc: public-rdf-comments@w3.org, Semantic Web <semantic-web@w3.org>
Updated the CRG-Turtle library. Thanks - it passes those triples correctly
now.

Paul Gearon

On Wed, Feb 12, 2014 at 3:42 PM, Eric Prud'hommeaux <eric@w3.org> wrote:

> The RDF Working Group recently discovered an error in the grammars for
> Turtle and TriG. They were intened to align with SPARQL, but a pair of
> parentheses was accidentally dropped from the definition for long
> strings resulting in an over-constraint on what's permitted after
> embedded quotes. An example of the error is shown by the text
>
>    """ ""\" """
>
> which is allowed by the SPARQL grammar, but was accidentally
> disallowed by the grammars for Turtle and TriG in their specifications.
> After considering this matter, the acting W3C Director has asked us to
> make sure implementors agree this is an error and will in the coming
> weeks make sure their implementations parse the intended language,
> aligned with SPARQL.
>
> Please let us know by 18 Feb if you intend to implement the following
> grammar and parse the syntax tests below:
>
> change
> [24] STRING_LITERAL_LONG_SINGLE_QUOTE ::= "'''" (("'" | "''")? [^'\] |
> ECHAR | UCHAR)* "'''"
> [25] STRING_LITERAL_LONG_QUOTE          ::= '"""' (('"' | '""')? [^"\] |
> ECHAR | UCHAR)* '"""'
> to
> [24] STRING_LITERAL_LONG_SINGLE_QUOTE ::= "'''" (("'" | "''")? ([^'\] |
> ECHAR | UCHAR))* "'''"
> [25] STRING_LITERAL_LONG_QUOTE          ::= '"""' (('"' | '""')? ([^"\] |
> ECHAR | UCHAR))* '"""'
>
> and parse these (one-line) turtle documents (with some arbitrary base URI):
>
> <s> <p> ''' ''\' ''' .
>
> <s> <p> """ ""\" """ .
>
> <s> <p> """ ""\u0061 """ .
>
> <s> <p> """""\"""" .
>
> <s> <p> """""\u0061""" .
>
>
> Many thanks for your help and continued support of RDF 1.1.
>
> --
> -ericP, on behalf of the RDF Working Group
>
> office: +1.617.599.3509
> mobile: +33.6.80.80.35.59
>
> (eric@w3.org)
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>
Received on Thursday, 13 February 2014 00:54:52 UTC

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