Relation pm#spatial_relation_from_entity_with_spatial_feature (object,*)
  exclusion:  relation_from_situation  relation_from_collection  relation_from_description_content/medium/container  relation_from_attribute_or_quality_or_measure
  subtype:  relation_from_spatial_object  front_fn  back_fn  traverses  distance  larger  smaller  connected  connects  mereological_sum_fn  mereological_product_fn  mereological_difference_fn  hole  hole_host_fn  partially_fills  hole_skin_fn  orientation  between  part
  supertype:  relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
     >part of:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type