#plane_maximum_altitude__planemaximumaltitude__ceiling  maximum altitude at which a plane can fly (under specified conditions)
  subtype:  #absolute_ceiling  #combat_ceiling
  supertype:  #altitude.elevation__height  elevation especially above sea level or above the earth's surface
     supertype:  #elevation  distance of something above a reference point
        supertype:  #distance  the property created by the space between two objects or points
           supertype:  #spatial_arrangement__spatialarrangement__spacing  the property possessed by an array of things that have space between them
              supertype:  #placement.position__arrangement  the spatial property of the way in which something is placed: "the arrangement of the furniture"; "the placement of the chairs"
                 supertype:  #spatial_relation__spatialrelation__position__spatial_property__spatialproperty  the spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage"
                    supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
                       supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                          supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                             supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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