Relation dl#depends_on__dependson (endurant,quality_or_endurant_or_perdurant)
  supertype:  mediated_relation
  inverse:  depend_on_of
  subtype:  physically_depends_on (endurant,PQ_or_PED_or_PR_or_PD)
  subtype:  descriptively_depends_on__descriptivelydependson (endurant,non-physical_endurant)