[dotNetRDF-Support] typed literals

[Mark D W. <mar...@ko...>]

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