java - OWLAPI : HermiT reasoner thows "UnsupportedDatatypeException" for data type from imported Ontology -

i have 2 ontologies (generated through protege).

a ontology (a.owl) :-

<?xml version="1.0"?> <!doctype rdf:rdf [     <!entity owl "http://www.w3.org/2002/07/owl#" >     <!entity xsd "http://www.w3.org/2001/xmlschema#" >     <!entity rdfs "http://www.w3.org/2000/01/rdf-schema#" >     <!entity rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" > ]> <rdf:rdf xmlns="http://www.semanticweb.org/ontologies/a#"      xml:base="http://www.semanticweb.org/ontologies/a"      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"      xmlns:owl="http://www.w3.org/2002/07/owl#"      xmlns:xsd="http://www.w3.org/2001/xmlschema#"      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">     <owl:ontology rdf:about="http://www.semanticweb.org/ontologies/a">         <owl:imports rdf:resource="http://www.semanticweb.org/ontologies/z"/>     </owl:ontology>     <!--      ///////////////////////////////////////////////////////////////////////////////////////     //     // classes     //     ///////////////////////////////////////////////////////////////////////////////////////      -->     <!-- http://www.semanticweb.org/ontologies/a#a -->     <owl:class rdf:about="http://www.semanticweb.org/ontologies/a#a">         <rdfs:subclassof rdf:resource="http://www.semanticweb.org/ontologies/a#b"/>     </owl:class>     <!-- http://www.semanticweb.org/ontologies/a#b -->     <owl:class rdf:about="http://www.semanticweb.org/ontologies/a#b"/> </rdf:rdf> <!-- generated owl api (version 3.5.1) http://owlapi.sourceforge.net --> 

z ontology (z.owl) :-

<?xml version="1.0"?> <!doctype rdf:rdf [     <!entity owl "http://www.w3.org/2002/07/owl#" >     <!entity xsd "http://www.w3.org/2001/xmlschema#" >     <!entity rdfs "http://www.w3.org/2000/01/rdf-schema#" >     <!entity rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" > ]> <rdf:rdf xmlns="http://www.semanticweb.org/ontologies/z#"      xml:base="http://www.semanticweb.org/ontologies/z"      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"      xmlns:owl="http://www.w3.org/2002/07/owl#"      xmlns:xsd="http://www.w3.org/2001/xmlschema#"      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">     <owl:ontology rdf:about="http://www.semanticweb.org/ontologies/z"/>     <!--      ///////////////////////////////////////////////////////////////////////////////////////     //     // datatypes     //     ///////////////////////////////////////////////////////////////////////////////////////      -->     <!-- http://www.semanticweb.org/ontologies/z#myname -->     <rdfs:datatype rdf:about="http://www.semanticweb.org/ontologies/z#myname"/>     <!--      ///////////////////////////////////////////////////////////////////////////////////////     //     // object properties     //     ///////////////////////////////////////////////////////////////////////////////////////      -->     <!-- http://www.semanticweb.org/ontologies/z#myprop -->     <owl:objectproperty rdf:about="http://www.semanticweb.org/ontologies/z#myprop"/>     <!--      ///////////////////////////////////////////////////////////////////////////////////////     //     // data properties     //     ///////////////////////////////////////////////////////////////////////////////////////      -->     <!-- http://www.semanticweb.org/ontologies/z#name -->     <owl:datatypeproperty rdf:about="http://www.semanticweb.org/ontologies/z#name">         <rdfs:range rdf:resource="http://www.semanticweb.org/ontologies/z#myname"/>     </owl:datatypeproperty>     <!--      ///////////////////////////////////////////////////////////////////////////////////////     //     // classes     //     ///////////////////////////////////////////////////////////////////////////////////////      -->     <!-- http://www.semanticweb.org/ontologies/z#x -->     <owl:class rdf:about="http://www.semanticweb.org/ontologies/z#x">         <rdfs:subclassof rdf:resource="http://www.semanticweb.org/ontologies/z#y"/>     </owl:class>     <!-- http://www.semanticweb.org/ontologies/z#y -->     <owl:class rdf:about="http://www.semanticweb.org/ontologies/z#y"/> </rdf:rdf> <!-- generated owl api (version 3.5.1) http://owlapi.sourceforge.net --> 

i have imported z.owl inside a.owl. when run hermit reasoner a ontology. throws , org.semanticweb.hermit.datatypes.unsupporteddatatypeexception exception.

exception details :-

exception in thread "main" org.semanticweb.hermit.datatypes.unsupporteddatatypeexception: hermit supports , datatypes of owl 2 datatype map, see  http://www.w3.org/tr/owl2-syntax/#datatype_maps.  datatype 'http://www.semanticweb.org/ontologies/z#myname' not part of owl 2 datatype map ,  no custom datatype definition given;  therefore, hermit cannot handle datatype. 

my java code :-

configuration reasonerconf = new configuration();             reasonerconf.throwinconsistentontologyexception = false; reasonerfactory factory = new reasonerfactory(); owlreasoner reasoner = factory.createreasoner(owlontology, reasonerconf); //line throws above exception 

owlontology current working ontology 'a' loaded owlmanager (owlontologymanager). 'z' ontology in owlmanager.

i tried run hermit reasoner in protege doesn't throw exception there.

you declared datatype:

<rdfs:datatype rdf:about="http://www.semanticweb.org/ontologies/z#myname"/> 

but has no associated definition. lexical form? "foo"^^ex:myname legal instance or not? equivalent value "foo"^^ex:myname or not? hermit doesn't have way know answer these questions, , complains:

the datatype 'http://www.semanticweb.org/ontologies/z#myname' not part of owl 2 datatype map , no custom datatype definition given; therefore, hermit cannot handle datatype.

you'll need provide kind of definition datatype hermit can understand, or perhaps use datatype facets instead.