Relation pm#descr_container__description_support___descr_support (description,description_container)  permits to associate a statement with an object on which it is represented
  supertype:  relation_from_description (description,*)
     supertype:  relation_from_description_content/medium/container (description_content/medium/container,*)
        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
           >part of:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
  supertype:  descr_in__descrin (?,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
     supertype:  file_or_file_element (?,description_container)
        supertype:  Description (?,entity)  to specify an account of the content of a resource; in WebKB, pm#topic or pmdescr SHOULD BE USED INSTEAD
           supertype:  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:  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:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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