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
  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
  subtype:  relation_from_spatial_object (spatial_object,*)
     subtype:  relation_to_another_spatial_object (spatial_object,spatial_object)
        subtype:  location (spatial_object,spatial_object)
           subtype:  address__addres (spatial_object -> spatial_object)
              subtype:  main_address (spatial_object -> spatial_object)
              subtype:  secondary_address__secondaryaddres (spatial_object -> spatial_object)
           subtype:  above (spatial_object -> spatial_object)
              subtype:  on (spatial_object -> spatial_object)
           subtype:  below (spatial_object,spatial_object)
           subtype:  near (spatial_object -> spatial_object)
              subtype:  touching (spatial_object -> spatial_object)
           subtype:  far_from__farfrom (spatial_object,spatial_object)
           subtype:  exterior__in (spatial_object -> spatial_object)
           subtype:  interior (spatial_object,spatial_object)
           subtype:  before_location__before (spatial_object,spatial_object)
        subtype:  spatial_part__spatialpart (spatial_object,spatial_object)
           subtype:  physical_part (physical_entity,physical_entity)
     subtype:  facility (spatial_object,?)
  subtype:  front_fn__frontfn (self_connected_object -> self_connected_object)  a function that maps an object to the side that generally receives the most attention or that typically faces the direction in which the object moves; note that this is a partial function, since some objects do not have sides, e.g., apples and spheres; note too that the range of this function is indefinite in much the way that immediate_future_fn and immediate_past_fn are indefinite; although this indefiniteness is undesirable from a theoretical standpoint, it does not have significant practical implications, since there is widespread intersubjective agreement about the most common cases
  subtype:  back_fn (self_connected_object -> self_connected_object)  a function that maps an object to the side that is opposite the front_fn of the object; note that this is a partial function, since some objects do not have sides, e.g., apples and spheres; note too that the range of this function is indefinite in much the way that immediate_future_fn and immediate_past_fn are indefinite; although this indefiniteness is undesirable from a theoretical standpoint, it does not have significant practical implications, since there is widespread intersubjective agreement about the most common cases
  subtype:  traverses__traverse (object,object)  the first object crosses or extends across the second; note that crosses and penetrates are subrelations of traverses
     subtype:  crosses__crosse (object,object)  the 1st object traverses the second without being connected to it
     subtype:  penetrates (object,object)  the 1st object is connected to the second along at least one whole dimension (length, width or depth)
  subtype:  distance (object,*)
  subtype:  larger (object,*)
  subtype:  smaller (object,*)
  subtype:  connected (object,*)
  subtype:  connects (object,*)
  subtype:  mereological_sum_fn (object,*)
  subtype:  mereological_product_fn (object,*)
  subtype:  mereological_difference_fn (object,*)
  subtype:  hole (object,*)
  subtype:  hole_host_fn (object,*)
  subtype:  partially_fills__partiallyfill (object,*)
  subtype:  hole_skin_fn (object,*)
  subtype:  orientation (object,*)
  subtype:  between (object,object,object)  the second object is (directly) spatially located between the other two (the projections of which overlap with the second object)
  subtype:  part__part_of (object,object)  this type should have been name sumo#part_of to respect the common reading conventions of parameters; all other mereological relations are defined in terms of this one; it means that the 1st argument is part of the 2nd; note that, since part is a reflexive_relation, every object is a part of itself
     subtype:  proper_part__proper_part_of (object,object)  the 1st argument is part of the 2nd but is not it; this is a transitive_relation and asymmetric_relation (hence an irreflexive_relation)
     subtype:  piece__piece_of__pieceof (substance,substance)  a specialized common sense notion of part for arbitrary parts of substances; quasi-synonyms are: chunk, hunk, bit, etc; compare component, another subrelation of part
     subtype:  component__component_of__componentof (corpuscular_object,corpuscular_object)  a specialized common sense notion of part for heterogeneous parts of complexes; the 1st argument is a component of the 2nd argument; examples: the doors and walls of a house, the states or provinces of a country, or the limbs and organs of an animal; compare with sumo#piece, another specialization of sumo#part
     subtype:  member (self_connected_object,collection)  a specialized common sense notion of part for uniform parts of collections; for example, each sheep in a flock of sheep would have the relationship of member to the flock