| Definition: An xref that defines a reference to an entity in an external resource that does not have the same biological identity as the referring entity. Comment: There is currently no controlled vocabulary of relationship types for BioPAX, although one will be created in the future if a need develops. Examples: A link between a gene G in a BioPAX data collection, and the protein product P of that gene in an external database. This is not a unification xref because G and P are different biological entities (one is a gene and one is a protein). Another example is a relationship xref for a protein that refers to the Gene Ontology biological process, e.g. ‘immune response,’ that the protein is involved in. |
| •owl:Thing |
| •utilityClass |
| •externalReferenceUtilityClass |
| •xref |
| •relationshipXref |
| xref |
| DB EQ 1 |
| ID EQ 1 |
| RELATIONSHIP-TYPE MAX 1 |
Class(relationshipXref partial xref
restriction(DB cardinality(1))
restriction(ID cardinality(1))
restriction(RELATIONSHIP-TYPE maxCardinality(1)))
DisjointClasses(relationshipXref unificationXref
publicationXref)