Do not use this relation directly. It is ended as a grouping for a diverse set of relations, all involving parthood or connectivity relationships

A mereological relationship or a topological relationship

http://purl.obolibrary.org/obo/ro.owl,http://purl.obolibrary.org/obo/cl.owl

http://purl.obolibrary.org/obo/RO_0001901

Chris Mungall