Relation pm#relation_to_another_attribute_or_quality_or_measure (pm#attribute_or_quality_or_measure,pm#attribute_or_quality_or_measure)
  supertype:  pm#relation_from_attribute_or_quality_or_measure  pm#relation_to_attribute_or_quality_or_measure
  subtype:  pm#measure (pm#attribute_or_quality_or_measure,pm#attribute_or_quality_or_measure)  e.g., [a weight, measure: 75 kg]
  subtype:  dl#q_location__qlocation (dl#quality,dl#region)
     subtype:  dl#has_quale__hasquale__ql (dl#quality,dl#quale)