Relation pm#descr_in__descrin (?,pm#description_container)  when a thing t has a description stored in a description container dc, there is a relation pm#descr_in from t to dc
  subtype:  pm#descr_container  permits to associate a statement with an object on which it is represented
  supertype:  pm#file_or_file_element (?,pm#description_container)
     supertype:  dc#Description (?,pm#entity)  to specify an account of the content of a resource; in WebKB, pm#topic or pmdescr SHOULD BE USED INSTEAD
        supertype:  pm#binary_relation (?,?)  in WebKB, most relation types are binary and some have a variable number of arguments (as in KIF), hence this type is currently only specialized by types that I do not want to see as direct subtypes of pm#relation
           supertype:  pm#relation_with_particular_property (*)  this rather fuzzy type permits to group categorization schemes less common than those covered by the previous sibling categories
              >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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