#observation.fact  facts learned by observing; "he reported his observations to the mayor"
  subtype:  #scientific_fact  an observation that has been confirmed repeatedly and is accepted as true (although its truth is never final)
  supertype:  #fact  a piece of information about circumstances that exist or events that have occurred; "first you must collect all the facts of the case"
     supertype:  #information  knowledge acquired through study or experience or instruction
        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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