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Re: issues with TriG Test Suite

From: Gregg Kellogg <gregg@greggkellogg.net>
Date: Sat, 27 Dec 2014 16:25:10 -0800
Cc: public-rdf-comments@w3.org, Markus Lanthaler <markus.lanthaler@gmx.net>
Message-Id: <E5545899-A8E4-452F-942E-22E755553967@greggkellogg.net>
To: Ruben Verborgh <ruben.verborgh@ugent.be>
> On Dec 27, 2014, at 8:05 AM, Ruben Verborgh <ruben.verborgh@ugent.be> wrote:
> 
> Dear all,
> 
> I am extending the N3.js JavaScript RDF library [1],
> with support for TriG, in addition to Turtle.
> During this process, I ran into the issues below.
> 
> 1. The following tests have the wrong title:
> - trig-syntax-bad-n3-extras-01
> - trig-syntax-bad-n3-extras-02
> - trig-syntax-bad-n3-extras-03
> - trig-syntax-bad-n3-extras-04
> - trig-syntax-bad-n3-extras-05
> - trig-syntax-bad-n3-extras-06
> - trig-syntax-bad-n3-extras-07
> - trig-syntax-bad-n3-extras-08
> - trig-syntax-bad-n3-extras-09
> - trig-syntax-bad-n3-extras-10
> - trig-syntax-bad-n3-extras-11
> - trig-syntax-bad-n3-extras-12
> - trig-syntax-bad-n3-extras-13
> They are named "X is not / X not in Turtle"
> but should be named "X is not / X not in TriG".

Indeed, I'll send a fixed Manifest to Ivan for him to update, as I don't have write access to the repo any longer. Note that it doesn't change anything about processing, just the description of the tests (obviously, simply copied from Turtle).

> 2. Tests are served from the wrong URL.
> For instance, if we fetch
>    http://www.w3.org/2013/TriGTests/trig-subm-27.trig
> it redirects with a 301 to (note the capitalization difference)
>    http://www.w3.org/2013/TrigTests/trig-subm-27.trig
> yet the file itself says (note again the capitalization difference)
>    # In-scope base URI is <http://www.w3.org/2013/TriGTests/trig-subm-27.trig> at this point
> This can be fixed by setting the canonical URL to:
>    http://www.w3.org/2013/TriGTests/{}

Where did you find the <http://www.w3.org/2013/TriGTests/> URL? The RDF 1.1 Test Cases document [1] references <http://www.w3.org/2013/TrigTests/>.

> 3. trig-syntax-minimal-whitespace-01 contains three syntax errors
> on line 12 and should thus not parse. The line reads:
>    {_:s:p :o ._:s:p"Alice". _:s:p _:o .}
> While the first triple is probably intended to be parsed as:
>    _:s <http://example/a/p> <http://example/a/o>
> and thus to be lexed as:
>    PrefixedName(PNAME_LN) PrefixedName(PNAME_LN) PrefixedName(PNAME_LN) '.'
> it actually needs to be lexed as:
>    PrefixedName(PNAME_LN) PrefixedName(PNAME_LN) '.'
> because PNAME_LN consists of PNAME_NS PN_LOCAL, and the latter may contain colons.
> This behavior is asserted in localname_with_COLON,
> so I find it strange that implementations exist which pass both tests.
> To correct this test case, whitespace should be inserted after each '_:s'.

Not an official response, but _:s is a Blank Node, not a PName, so it is defined as "_:" followed by PN_CHARS_BASE, which doesn't include ':'. PNAME_LN uses PN_LOCAL, which does include ':'. I believe the test is valid.

> When we find a resolution to the third point,
> I'll have a new EARL report to share
> for http://www.w3.org/2013/TrigReports/index.html :-)

I can certainly create a new report, but I'm not sure about updating that link, as it records what was used to transition.

Gregg

> Best,
> 
> Ruben
> 
> [1] https://github.com/RubenVerborgh/N3.js
Received on Sunday, 28 December 2014 00:25:40 UTC

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