Relation ADJACENT-TO

Close to, near or abutting another physical unit with no other structure of the same kind intervening. This includes adjoins, abuts, is contiguous to, is juxtaposed, and is close to.
Arity: 2
Domain: Localized-entity
Mapping: Here adjacency has a wide sense: without contact or with boundary contact, while 'near' from theory:positions is limited to without contact, and 'externally-connected' from theory:topology is limited to boundary contact.
Range: Localized-entity
Subrelation-Of: Position-relation
Axioms:
(<=> (Adjacent-To ?A ?B)
     (And (Or (Near ?A ?B) (Touches ?A ?B))
          (Position-Relation ?A ?B)))