NTriples datatype display broken

report=Your ntriples output silently drops the datatype.

Cheers,
Bijan.
RDF=<!DOCTYPE uridef [
	<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns">
	<!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema">
	<!ENTITY owl "http://www.w3.org/2002/07/owl">
	<!ENTITY xsd "http://www.w3.org/2001/XMLSchema">
	<!ENTITY process
"http://www.mindswap.org/~bparsia/ontologies/sws/iope-exp.owl">
]>
<!--
This document uses entity types as a shorthand for URIs.
For a version with unexpanded entities, try loading this source
into Internet Explorer.
   -->
<rdf:RDF xmlns:rdf="&rdf;#" xmlns:rdfs="&rdfs;#" xmlns:owl="&owl;#"
xmlns:xsd="&xsd;#" xmlns:process="&process;#"  
xmlns="http://www.mindswap.org/~bparsia/ontologies/sws/iope- 
example.owl#"
xml:base="http://www.mindswap.org/~bparsia/ontologies/sws/iope- 
example.owl">



<owl:Class rdf:ID="A">
	<owl:disjointWith>
		<owl:Class rdf:ID="B"/>
	</owl:disjointWith>
</owl:Class>

<owl:Class rdf:ID="AA">
	<rdfs:subClassOf>
		<owl:Restriction>
			<owl:onProperty>
				<owl:ObjectProperty rdf:ID="p"/>
			</owl:onProperty>
			<owl:someValuesFrom rdf:resource="#A"/>
		</owl:Restriction>
	</rdfs:subClassOf>
	<rdfs:subClassOf>
		<owl:Restriction>
			<owl:onProperty rdf:resource="#p"/>
			<owl:cardinality  
rdf:datatype="&xsd;#nonNegativeInteger">1</owl:cardinality>
		</owl:Restriction>
	</rdfs:subClassOf>
</owl:Class>

<A rdf:ID="a1">
	<p>
		<B rdf:ID="b1"/>
	</p>
</A>
</rdf:RDF>