Relation dl#mediated_relation (entity,entity)
  supertype:  conceptual_relation
  inverse:  mediated_relation
  subtype:  present_at__presentat (endurant,time_interval)
  subtype:  q_present_at__qpresentat (physical_quality,time_interval)
  subtype:  happens_at__happensat (perdurant,time_interval)
  subtype:  overlaps (entity,entity)
  subtype:  sibling_part__siblingpart (entity,entity)
  subtype:  proper_part (entity,entity)  the subpart is different from the whole
  subtype:  generic_location__genericlocation (entity,entity)
     subtype:  exact_location__exactlocation (entity,region)
        subtype:  location (entity,region)
           subtype:  physical_location (physical_endurant,physical_region)
              subtype:  spatial_location__spatiallocation (physical_endurant,space_region)
           subtype:  temporal_location (perdurant,temporal_region)
              subtype:  duration (perdurant,temporal_region)
        subtype:  e_temporal_location (endurant,temporal_region)
        subtype:  p_spatial_location__pspatiallocation (perdurant,space_region)
        subtype:  abstract_location (non-physical_endurant,abstract_region)
        subtype:  depends_on_spatial_location (non-physical_endurant,space_region)
  subtype:  depends_on__dependson (endurant,quality_or_endurant_or_perdurant)
     subtype:  physically_depends_on (endurant,PQ_or_PED_or_PR_or_PD)
     subtype:  descriptively_depends_on__descriptivelydependson (endurant,non-physical_endurant)
  subtype:  host (feature,entity)