Relation sumo#knows__know (sumo#cognitive_agent,sumo#formula)  the agent knows the proposition expressed by the formula; knows entails conscious awareness, so this predicate cannot be used to express tacit or subconscious or unconscious knowledge
  type:  pm#propositional_attitude_relation_type  the class of intentional_relations where the agent has awareness of a proposition
  supertype:  pm#propositional_attitude_relation (sumo#cognitive_agent,sumo#formula)  intentional_relations where the agent has awareness of a proposition
     supertype:  pm#intentional_relation__intentionalrelation (sumo#cognitive_agent,?)  relations between an agent and one or more entities, where the relation requires that the agent has awareness of the entity
        supertype:  pm#relation_playing_a_special_role (*)  this type permits to categorize relations according to their roles ; this is a traditional but quite subjective way of categorizing relations
           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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