pm#intentional_relation_type  the class of relations between an agent and one or more entities, where the relation requires that the agent has awareness of the entity
  supertype:  relation_type  there are three kinds of relation(_types): pm#predicate_type, pm#function_type and sumo#list; both predicates and functions denote sets of ordered n-tuples; the difference between these two classes is that predicates cover formula-forming operators, while functions cover term-forming operators; a list, on the other hand, is a particular ordered n-tuple
  instance of:  class_of_inheritable_relation_type  instance:  intentional_relation__intentionalrelation (cognitive_agent,?)  relations between an agent and one or more entities, where the relation requires that the agent has awareness of the entity
     subtype:  prefers__prefer (cognitive_agent,formula,formula)  the cognitive_agent prefers the state of affairs expressed by the 1st formula over the state of affairs expressed by the 2nd formula, all things being equal
     subtype:  in_scope_of_interest (cognitive_agent,?)  the 2nd argument is within the scope of interest of the agent;  the interest indicated can be either positive or negative
     subtype:  propositional_attitude_relation (cognitive_agent,formula)  intentional_relations where the agent has awareness of a proposition
        subtype:  desires (cognitive_agent,formula)  the agent wants to bring about the state of affairs expressed by the formula (whcih may be already true); desires is distinguished from wants only in that the former is a propositional_attitude, while wants is an object_attitude
        subtype:  considers__consider (cognitive_agent,formula)  the agent considers or wonders about the truth of the proposition expressed by the formula
        subtype:  believes (cognitive_agent,formula)  the agent believes the proposition expressed by the formula
        subtype:  knows__know (cognitive_agent,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
     subtype:  object_attitude_relation (cognitive_agent,physical)  intentional_relations where the agent has awareness of an instance of sumo#physical
        subtype:  needs__need (cognitive_agent,physical)  the 2nd argument is physically required for the continued existence of the cognitive agent
        subtype:  wants__want (cognitive_agent,physical)  the agent believes that the 2nd argument will satisfy one of its goals; what is wanted may or may not be already possessed by the agent

  instance:  prefers  in_scope_of_interest
  equal:  intentional_relation (pm)
  subtype:  propositional_attitude_relation_type  the class of intentional_relations where the agent has awareness of a proposition
     instance:  propositional_attitude_relation (cognitive_agent,formula)  intentional_relations where the agent has awareness of a proposition
     instance:  desires  considers__consider  believes  knows__know
  subtype:  object_attitude_relation_type  the class of intentional_relations where the agent has awareness of an instance of  sumo#physical
     instance:  object_attitude_relation (cognitive_agent,physical)  intentional_relations where the agent has awareness of an instance of sumo#physical
     instance:  needs__need  wants__want

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