Re: [dotNetRDF-Support] typed literals

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

Mark

Please can you provide the exact code you use to reproduce this problem.  I
have tried in a couple of different ways and cannot reproduce the issue
locally

It would also be useful to know what version you are using (not that I am
aware of any relevant bugs that might be affecting you)

Rob

From:  Mark D Wood <mar...@ko...>
Reply-To:  dotNetRDF User Help and Support
<dot...@li...>
Date:  Monday, 15 December 2014 14:25
To:  dotNetRDF User Help and Support
<dot...@li...>
Subject:  Re: [dotNetRDF-Support] typed literals

> Hi Rob,
>  
> Thanks for the reply.
>  
> The tuples are getting loaded to the same graph against which the query is
> being executed; I verified that by querying for all tuples.
>  
> After reading the interesting article “RDF Literal Types in Practice” [1] I
> thought to try the following:
>  
> PREFIX me: <http://www.example.com/>
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> SELECT DISTINCT ?s ?p WHERE {
>   ?s ?p ?o .
>   FILTER (xsd:integer(?o) = 42)
> }
>  
> which in fact does work.
>  
> Somehow the pattern matching doesn’t match, though.
>  
> -Mark
>  
>  
>  
>  
> [1] 
> http://iswc2011.semanticweb.org/fileadmin/iswc/Papers/Workshops/SSWS/Emmons-et
> -all-SSWS2011.pdf
>  
>  
> 
> From: Rob Vesse [mailto:rv...@do...]
> Sent: Monday, December 15, 2014 7:05 AM
> To: dotNetRDF User Help and Support
> Subject: Re: [dotNetRDF-Support] typed literals
>  
> 
> Mark
> 
>  
> 
> You've likely run into the fact that when you've loaded your graph the library
> automatically assigned it a name so then when you ran your query it only
> considered the default graph which was empty rather than your named graph
> which contained the actual data.
> 
>  
> 
> https://bitbucket.org/dotnetrdf/dotnetrdf/wiki/UserGuide/Querying%20with%20SPA
> RQL#!default-graph
> 
>  
> 
> You likely just need to make sure that your loaded graph is actually the
> default graph which you can do in several ways, the easiest of which (assuming
> you have only a single graph) is simply to set the BaseUri property to null
> after loading your data so that the graph is treated as the default graph when
> you add it to a store ready for querying.
> 
>  
> 
> Rob
> 
>  
> 
> From: Mark D Wood <mar...@ko...>
> Reply-To: dotNetRDF User Help and Support
> <dot...@li...>
> Date: Friday, 12 December 2014 20:50
> To: "dot...@li..."
> <dot...@li...>
> Subject: [dotNetRDF-Support] typed literals
> 
>  
>> 
>> I’m noticing some anomalies in the handling of typed literals
>>  
>> Here’s a very simple RDF/XML file, with just two statements.  The first has a
>> literal with an integer typed value of 42.
>>  
>> <?xml version="1.0" encoding="utf-8"?>
>> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#
>> <http://www.w3.org/1999/02/22-rdf-syntax-ns> "
>> xmlns:dc="http://purl.org/dc/elements/1.1/"
>> xml:base="http://www.w3.org/2001/XMLSchema#
>> <http://www.w3.org/2001/XMLSchema> " xmlns:me="http://www.example.com/"
>> <http://www.example.com/%22> >
>> <rdf:Description rdf:about="urn:guid:00000000-0000-0000-0000-000000000003" >
>>                <me:A
>> rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">42</me:A>
>>                <me:B rdf:datatype="integer">37</me:B>
>> </rdf:Description>
>> </rdf:RDF>
>>  
>> If I execute the following query,
>>  
>> PREFIX me: <http://www.example.com/>
>> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#
>> <http://www.w3.org/2001/XMLSchema> >
>> SELECT DISTINCT ?s ?p WHERE {
>>   ?s ?p 42 .
>> }
>> LIMIT 25
>>  
>> the two external triplestore implementations I tried correctly return one
>> tuple; however, the dotNetRDF LeviathanQueryProcessor using the in-memory
>> store does not return any tuples.  Is this a bug, or operator error?
>>  
>> Also, I was hoping to reduce the size of my RDF/XML by using the xml:base
>> construct, but I don’t seem to be able to get the xml:base attribute to take
>> effect.  Is there a trick to getting that to work?
>>  
>> Thanks,
>> -Mark
>>  
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