Relation higgins#complexMetadata__complexmetadata (pm#Higgins_DigitalSubject_or_Value,?)  Used as the super-Property of some ObjectProperties of higgins:ValueAndMetadata or higgins:DigitalSubject to indicate that these properties are considered to be metadata about the ValueAndMetadata (or DigitalSubject)
  supertype:  pm#Higgins_object_property (pm)
  subtype:  higgins#source (higgins#Value,higgins#SubjectRelationship)
  subtype:  higgins#creator (higgins#Value,higgins#SubjectRelationship)
  subtype:  higgins#timeSpan (pm#Higgins_DigitalSubject_or_Value,higgins#TimeSpan)