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Table 1 First version of the OBO Relation Ontology

From: Relations in biomedical ontologies

Foundational relations
is_a
part_of
Spatial relations (connecting one entity to another in terms of relations between the spatial regions they occupy)
located_in
contained_in
adjacent_to
Temporal relations (connecting entities existing at different times)
transformation_of
derives_from
preceded_by
Participation relations (connecting processes to their bearers)
has_participant
has_agent