xref

Definition: A reference from an instance of a class in this ontology to an object in an external resource. Comment: Instances of the xref class should never be created and more specific classes should be used instead.

Source:http://www.biopax.org/release/biopax-level2.owl#xref

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Named Graph Language Inference

Statements in which the resource exists as a subject.
Predicate	Object
rdf:type	owl:Class, owl:Class, owl:Class
rdfs:comment	Definition: A reference from an instance of a class in this ontology to an object in an external resource. Comment: Instances of the xref class should never be created and more specific classes should be used instead., Definition: A reference from an instance of a class in this ontology to an object in an external resource. Comment: Instances of the xref class should never be created and more specific classes should be used instead., Definition: A reference from an instance of a class in this ontology to an object in an external resource. Comment: Instances of the xref class should never be created and more specific classes should be used instead.
owl:disjointWith	http://www.biopax.org/release/biopax-level2.owl#bioSource, http://www.biopax.org/release/biopax-level2.owl#bioSource, http://www.biopax.org/release/biopax-level2.owl#bioSource, http://www.biopax.org/release/biopax-level2.owl#dataSource, http://www.biopax.org/release/biopax-level2.owl#dataSource, http://www.biopax.org/release/biopax-level2.owl#dataSource, http://www.biopax.org/release/biopax-level2.owl#openControlledVocabulary, http://www.biopax.org/release/biopax-level2.owl#openControlledVocabulary, http://www.biopax.org/release/biopax-level2.owl#openControlledVocabulary
rdfs:subClassOf	http://www.biopax.org/release/biopax-level2.owl#externalReferenceUtilityClass, http://www.biopax.org/release/biopax-level2.owl#externalReferenceUtilityClass, http://www.biopax.org/release/biopax-level2.owl#externalReferenceUtilityClass