Relation pm#version (description_content/medium/container,description_content/medium/container)
  supertype:  relation_from_description_content/medium/container
  subtype:  ascii_content__asciicontent (description_content/medium/container,string)
     subtype:  exact_ascii_content__exactasciicontent (description_content/medium/container,string)
     subtype:  ascii_content_except_for_spaces (description_content/medium/container,string)