How to create OWL file that can query by knowrob normally?

edit

I followed knowrob tutorials.

I create an owl file sam_world.owl by protege.

  <?xml version="1.0"?>


  <!DOCTYPE Ontology [
      <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
      <!ENTITY xml "http://www.w3.org/XML/1998/namespace" >
      <!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
      <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
  ]>


  <Ontology xmlns="http://www.w3.org/2002/07/owl#"
       xml:base="http://www.semanticweb.org/ira/ontologies/2012/7/untitled-ontology-4"
       xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
       xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
       xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
       xmlns:xml="http://www.w3.org/XML/1998/namespace"
       ontologyIRI="http://www.semanticweb.org/ira/ontologies/2012/7/untitled-ontology-4">
      <Prefix name="" IRI="http://www.w3.org/2002/07/owl#"/>
      <Prefix name="owl" IRI="http://www.w3.org/2002/07/owl#"/>
      <Prefix name="rdf" IRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#"/>
      <Prefix name="xsd" IRI="http://www.w3.org/2001/XMLSchema#"/>
      <Prefix name="rdfs" IRI="http://www.w3.org/2000/01/rdf-schema#"/>
      <Declaration>
          <Class IRI="#book"/>
      </Declaration>
      <Declaration>
          <Class IRI="#cup"/>
      </Declaration>
      <Declaration>
          <Class IRI="#flower"/>
      </Declaration>
      <Declaration>
          <Class IRI="#outside"/>
      </Declaration>
      <Declaration>
          <Class IRI="#room"/>
      </Declaration>
      <Declaration>
          <Class IRI="#sidewalk"/>
      </Declaration>
      <SubClassOf>
          <Class IRI="#book"/>
          <Class IRI="#room"/>
      </SubClassOf>
      <SubClassOf>
          <Class IRI="#cup"/>
          <Class IRI="#room"/>
      </SubClassOf>
      <SubClassOf>
          <Class IRI="#flower"/>
          <Class IRI="#outside"/>
      </SubClassOf>
      <SubClassOf>
          <Class IRI="#sidewalk"/>
          <Class IRI="#outside"/>
      </SubClassOf>
  </Ontology>



  <!-- Generated by the OWL API (version 3.3.1957) http://owlapi.sourceforge.net -->

And I load knowrob:

  rosrun rosprolog rosprolog mod_vis

Then I load my own owl file and query it...

It shows many warnings and one query error:

  ?- owl_parser:owl_parse('/home/sam/code/ros/sam_ai/sam_owl/sam_world.owl', false, false, true).
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:12: Unexpected element http://www.w3.org/2002/07/owl# : Ontology
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:19: Unexpected element http://www.w3.org/2002/07/owl# : Prefix
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:20: Unexpected element http://www.w3.org/2002/07/owl# : Prefix
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:21: Unexpected element http://www.w3.org/2002/07/owl# : Prefix
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:22: Unexpected element http://www.w3.org/2002/07/owl# : Prefix
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:23: Unexpected element http://www.w3.org/2002/07/owl# : Prefix
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:24: Unexpected element http://www.w3.org/2002/07/owl# : Declaration
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:25: Unexpected element http://www.w3.org/2002/07/owl# : Class
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:27: Unexpected element http://www.w3.org/2002/07/owl# : Declaration
  Warning: RDF: file:///home/sam/code/ros/sam_ai/sam_owl/sam_world.owl:28: Unexpected element http ...