Re: [dotNetRDF-Develop] TriG parsing

[Rob V. <rv...@do...>]

It was a bug pertaining to support for literals in collections, this is
logged as CORE-403 
(http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=403) and I'm
working on the fix for it which should be fairly trivial

Rob

On 28/02/2014 16:21, "Tomasz Pluskiewicz" <tom...@gm...>
wrote:

>To be clear I do mean rdf:List and not object lists. This works in
>Turtle naturally:
>
>@prefix : <http://example/> .
>:resource :predicate1 ( "a" "b" "c" ).
>:resource :predicate2 ( :a :b :c ).
>
>But add a graph to make it TriG and the parser throws a
>NullReferenceException. Checked only in rdfEditor currently.
>
>@prefix : <http://example/> .
>:graph
>{
>    :resource :predicate1 ( "a" "b" "c" ).
>    :resource :predicate2 ( :a :b :c ).
>}
>
>Or is this syntax not defined in the spec?
>
>Thanks,
>Tom
>
>On Fri, Feb 28, 2014 at 5:05 PM, Rob Vesse <rv...@do...> wrote:
>> Do you mean they aren't being permitted nested inside something else?
>>
>> That sounds like a possible bug, please file an issue or send me an
>> example that fails
>>
>> Rob
>>
>> On 28/02/2014 11:00, "Tomasz Pluskiewicz" <tom...@gm...>
>> wrote:
>>
>>>I see. The problem is with RDF lists. When in shortcut syntax they are
>>>not recognized.
>>>
>>>Thanks,
>>>Tom
>>>
>>>On Fri, Feb 28, 2014 at 11:42 AM, Rob Vesse <rv...@do...>
>>>wrote:
>>>> Tom
>>>>
>>>> We also don't yet support the latest TriG specification so the bug may
>>>>be
>>>> down to using a syntax feature that we don't support yet.
>>>>
>>>> Rob
>>>>
>>>> On 28/02/2014 10:26, "Tomasz Pluskiewicz"
>>>><tom...@gm...>
>>>> wrote:
>>>>
>>>>>Good news. Thanks!
>>>>>
>>>>>And this reminds me. We have found a bug in the TriG parser. Will
>>>>>write an email to the other list.
>>>>>
>>>>>Tom
>>>>>
>>>>>On Fri, Feb 28, 2014 at 11:08 AM, Rob Vesse <rv...@do...>
>>>>>wrote:
>>>>>> Tom
>>>>>>
>>>>>> I have parsing support working on trunk with the NTriples and NQuads
>>>>>> parsers defaulting to the new spec so they'll read the data in as
>>>>>>UTF-8
>>>>>> rather than as ASCII.  We're passing all the official RDF 1.1 tests
>>>>>>for
>>>>>> NTriples and NQuads but I can't guarantee there aren't any bugs
>>>>>>introduced
>>>>>> though the changes to support the new spec turned out to be
>>>>>>relatively
>>>>>> minor.
>>>>>>
>>>>>> The parser changes have been merged onto default and I'm continuing
>>>>>>to
>>>>>> work on the ntuples11 branch for the remainder of the implementation
>>>>>>work.
>>>>>>  There's no output support for these formats yet but hopefully I'll
>>>>>>get
>>>>>> that done later today.
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Rob
>>>>>>
>>>>>> On 25/02/2014 10:22, "Rob Vesse" <rv...@do...> wrote:
>>>>>>
>>>>>>>Tom
>>>>>>>
>>>>>>>Yes the original NTriples and NQuads specifications only allow
>>>>>>>ASCII,
>>>>>>>this
>>>>>>>was by design to make those formats canonical (since with UTF-8 you
>>>>>>>can
>>>>>>>potentially encode complex characters in multiple ways) and
>>>>>>>facilitate
>>>>>>>reliable data exchange across systems that didn't necessarily
>>>>>>>support
>>>>>>>non-ASCII data.
>>>>>>>
>>>>>>>Btw the reader only enforces ASCII encoding if you pass a filename
>>>>>>>(I.e.
>>>>>>>when it deals with opening the file stream), if you pass in a
>>>>>>>pre-opened
>>>>>>>StreamReader that is in a different encoding (I.e. UTF-8) it may
>>>>>>>still
>>>>>>>parse successfully though exact behaviour is hard to know in
>>>>>>>advance.
>>>>>>>It
>>>>>>>will issue a warning about incorrect encoding (via the Warning
>>>>>>>event)
>>>>>>>and
>>>>>>>it may error out on some native UTF-8 data since the tokeniser is
>>>>>>>not
>>>>>>>written to expect native UTF-8.
>>>>>>>
>>>>>>>The RDF 1.1 working group have published proposed recommendations
>>>>>>>which
>>>>>>>standardise NQuads & NTriples and part of the standardization is to
>>>>>>>change
>>>>>>>the encoding to UTF-8 but I haven't had chance to update dotNetRDF
>>>>>>>to
>>>>>>>support the updated specs yet.
>>>>>>>
>>>>>>>Since this is a breaking change to spec and current API behaviour
>>>>>>>the
>>>>>>>existing tokenizers and parsers would need to be modified so that
>>>>>>>they
>>>>>>>can
>>>>>>>support either the new/old specification.  An approach similar to
>>>>>>>how
>>>>>>>we
>>>>>>>updated Turtle support where we implement the new specifications and
>>>>>>>the
>>>>>>>parsers default to the new spec mode  and the writers implement the
>>>>>>>new
>>>>>>>spec but default to producing the old spec as output would be ideal.
>>>>>>>This
>>>>>>>is Postel's law in action if you're wondering why this is done.
>>>>>>>
>>>>>>>There are issues filed for these upgrades but I haven't had time to
>>>>>>>implement them yet, I was considering trying to get these into the
>>>>>>>next
>>>>>>>release anyway and I have some time to start on this at the end of
>>>>>>>the
>>>>>>>week unless you want to attempt this yourself.  See CORE-356
>>>>>>>(http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=356) for
>>>>>>>NQuads
>>>>>>>and CORE-355
>>>>>>>(http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=355)
>>>>>>>for NTriples which include links to the updated specifications, see
>>>>>>>the
>>>>>>>comments for the most up to date spec links.
>>>>>>>
>>>>>>>Hope this clarifies things,
>>>>>>>
>>>>>>>Cheers,
>>>>>>>
>>>>>>>Rob
>>>>>>>
>>>>>>>On 25/02/2014 10:06, "Tomasz Pluskiewicz"
>>>>>>><tom...@gm...>
>>>>>>>wrote:
>>>>>>>
>>>>>>>>Hi Rob
>>>>>>>>
>>>>>>>>A colleague of mine has just discovered that the NQuadsParser reads
>>>>>>>>file with ASCII encoding while all other use UTF-8.
>>>>>>>>
>>>>>>>>I understand that this is as described in the specification but why
>>>>>>>>is
>>>>>>>>that exactly?
>>>>>>>>
>>>>>>>>And what do you think about adding a option to the parsers so that
>>>>>>>>alternative encodings can be used for reading dataset files?
>>>>>>>>
>>>>>>>>Cheers,
>>>>>>>>Tom
>>>>>>>>
>>>>>>>>-------------------------------------------------------------------
>>>>>>>>--
>>>>>>>>--
>>>>>>>>--
>>>>>>>>-
>>>>>>>>----
>>>>>>>>Flow-based real-time traffic analytics software. Cisco certified
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>>>>>>>>.c
>>>>>>>>lk
>>>>>>>>t
>>>>>>>>rk
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>>>>>>>kt
>>>>>>>rk
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>---------------------------------------------------------------------
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>>>>>>--
>>>>>>-----
>>>>>> Flow-based real-time traffic analytics software. Cisco certified
>>>>>>tool.
>>>>>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow
>>>>>>Analyzer
>>>>>> Customize your own dashboards, set traffic alerts and generate
>>>>>>reports.
>>>>>> Network behavioral analysis & security monitoring. All-in-one tool.
>>>>>>
>>>>>>http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg
>>>>>>.c
>>>>>>lk
>>>>>>trk
>>>>>> _______________________________________________
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>>>>>
>>>>>----------------------------------------------------------------------
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>>>>>Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>>>>Customize your own dashboards, set traffic alerts and generate
>>>>>reports.
>>>>>Network behavioral analysis & security monitoring. All-in-one tool.
>>>>>http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.
>>>>>cl
>>>>>kt
>>>>>rk
>>>>>_______________________________________________
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>>>>>https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>-----------------------------------------------------------------------
>>>>--
>>>>-----
>>>> Flow-based real-time traffic analytics software. Cisco certified tool.
>>>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>>> Customize your own dashboards, set traffic alerts and generate
>>>>reports.
>>>> Network behavioral analysis & security monitoring. All-in-one tool.
>>>>
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>>>>lk
>>>>trk
>>>> _______________________________________________
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>>>
>>>------------------------------------------------------------------------
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>>>----
>>>Flow-based real-time traffic analytics software. Cisco certified tool.
>>>Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>>Customize your own dashboards, set traffic alerts and generate reports.
>>>Network behavioral analysis & security monitoring. All-in-one tool.
>>>http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.cl
>>>kt
>>>rk
>>>_______________________________________________
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>>
>>
>>
>>
>>
>> 
>>-------------------------------------------------------------------------
>>-----
>> Flow-based real-time traffic analytics software. Cisco certified tool.
>> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>> Customize your own dashboards, set traffic alerts and generate reports.
>> Network behavioral analysis & security monitoring. All-in-one tool.
>> 
>>http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clk
>>trk
>> _______________________________________________
>> dotNetRDF-develop mailing list
>> dot...@li...
>> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>
>--------------------------------------------------------------------------
>----
>Flow-based real-time traffic analytics software. Cisco certified tool.
>Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>Customize your own dashboards, set traffic alerts and generate reports.
>Network behavioral analysis & security monitoring. All-in-one tool.
>http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clkt
>rk
>_______________________________________________
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