Relation pm#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
  subtype: {pm#relation_from_situation pm#spatial_relation_from_entity_with_spatial_feature pm#relation_from_collection pm#relation_from_description_content/medium/container pm#relation_from_attribute_or_quality_or_measure} {pm#relation_to_situation pm#spatial_relation_to_entity_with_spatial_feature pm#relation_to_time pm#relation_to_collection pm#relation_to_attribute_or_quality_or_measure}
  supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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