(documentationcontainsEnglishLanguage "The relation of spatial containment for two separable objects. When the two objects are not separable (e.g. an automobile and one of its seats), the relation of part should be used. (contains ?OBJ1 ?OBJ2) means that the SelfConnectedObject ?OBJ1 has a space (i.e. a HoleRegion) which is at least partially filled by ?OBJ2.")