Re: [dotNetRDF-Support] typed literals

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

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%20S
PARQL#!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#"
> xmlns:dc="http://purl.org/dc/elements/1.1/"
> xml:base="http://www.w3.org/2001/XMLSchema#"
> xmlns:me="http://www.example.com/">
> <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#>
> 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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