http://purl.obolibrary.org/obo/IAO_0000112 (continuant parthood, immaterial entity is part of material entity) @en
http://purl.obolibrary.org/obo/IAO_0000116 entity can be part of an immaterial entity; only a, material entity cannot be part of an immaterial entity @en
rdfs:seeAlso http://www.obofoundry.org/ro/#OBO_REL:part_of