Function dc#Format (description_content/medium/container -> entity)  to specify the physical or digital manifestation of a resource; in WebKB, this relation type SHOULD NOT BE USED; see pm#format, pm#description_instrument and pm#descr instead
  supertype:  relation_from_description_content/medium/container (pm)
  subtype:  format (description_content/medium/container -> description_content/medium/container)