Relation dl#part (dl#entity,dl#entity)  the subpart may or may not be different from the whole
  supertype:  pm#part_in_Dolce_Lite (pm)  dl#immediate_relation  pm#transitive_relation (pm)
  instance of:  pm#transitive_relation_type (pm)
  inverse:  dl#part_of
  subtype:  dl#component (dl#entity,dl#entity)
  subtype:  dl#atomic_part (dl#entity,dl#atom)  an undivisible part
     subtype:  dl#temporary_atomic_part__AtP (dl#entity,dl#atom)