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Re: Plain literals in Canonical N-triples

From: Peter Ansell <ansell.peter@gmail.com>
Date: Sun, 28 Dec 2014 10:13:33 +1100
Message-ID: <CAGYFOCQ14dxxVrRnV_VLG_U0ijKNdcuWYTFu-pDfxF41icHM3Q@mail.gmail.com>
To: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
Cc: public-rdf-comments <public-rdf-comments@w3.org>
Hi Stian,

RDF-1.1 does not have the concept of plain literals [1]. Hence, it is
difficult to map the OWL-WG-derived rdf:PlainLiteral set to RDF-1.1,
if that is where you are coming at the issue from [2].

Cheers,

Peter

[1] http://www.w3.org/TR/2014/REC-rdf11-concepts-20140225/#section-Graph-Literal
[2] https://github.com/owlcs/owlapi/issues/172

On 27 December 2014 at 16:37, Stian Soiland-Reyes
<soiland-reyes@cs.manchester.ac.uk> wrote:
> In http://www.w3.org/TR/n-triples/#canonical-ntriples I read:
>
>> Canonical N-Triples has the following additional constraints on layout:
>>
>>     The whitespace following subject, predicate, and object MUST be a single space, (U+0020). All other locations that allow whitespace MUST be empty.
>>     There MUST be no comments.
>>     HEX MUST use only uppercase letters ([A-F]).
>>     Characters MUST NOT be represented by UCHAR.
>>     Within STRING_LITERAL_QUOTE, only the characters U+0022, U+005C, U+000A, U+000D are encoded using ECHAR. ECHAR MUST NOT be used for characters that are allowed directly in STRING_LITERAL_QUOTE.
>
>
> and in http://www.w3.org/TR/n-triples/#sec-parsing-terms
>
>> If neither a language tag nor a datatype IRI is provided, the literal has a datatype of xsd:string.
>
>
> and in http://www.w3.org/TR/n-triples/#sec-literals
>
>> If there is no datatype IRI and no language tag it is a simple literal and the datatype is http://www.w3.org/2001/XMLSchema#string.
>
>> Example 3
>>     <http://example.org/show/218> <http://www.w3.org/2000/01/rdf-schema#label> "That Seventies Show"^^<http://www.w3.org/2001/XMLSchema#string> . # literal with XML Schema string datatype
>>     <http://example.org/show/218> <http://www.w3.org/2000/01/rdf-schema#label> "That Seventies Show" . # same as above
>
>
> So I am not any wiser with regards to how to serialize plain literals
> in RDF 1.1 Canoical N-Triples..
>
>
> Are both of the two examples allowed in Canonical N-Triples? (it seems
> so by the spec.. :-( ).
>
> Which variant should I generate?
>
>
> --
> Stian Soiland-Reyes, myGrid team
> School of Computer Science
> The University of Manchester
> http://soiland-reyes.com/stian/work/ http://orcid.org/0000-0001-9842-9718
>
Received on Saturday, 27 December 2014 23:14:00 UTC

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