Function pm#format (pm#description_content/medium/container -> pm#description_content/medium/container)
  supertype:  dc#Format (pm#description_content/medium/container -> pm#entity)  to specify the physical or digital manifestation of a resource; in WebKB, this relation type SHOULD NOT BE USED; see pm#format, pm#description_instrument and pm#descr instead
     supertype:  pm#relation_from_description_content/medium/container (pm#description_content/medium/container,*)
        supertype:  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
           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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