Relation pm#purpose (?,?)
  exclusion:  attributive_relation  has-author  owned-by  owner  owner_of  leader  seller  customer  generator  creator  spatial_origin  exploits  has_purpose  has_purpose_for_agent  measure  attribute  name  Date  value  rdf_reification_relation  support  example  syntax  has-magnitude
  supertype:  attributive_relation  why_relation
  subtype:  goal (process,situation)
  subtype:  purpose (description_content/medium/container,description_content/medium/container)  situation that the described action is intended to reach