#chain.linear_unit  a unit of length
  supertype:  linear_unit  a unit of measurement of length
  part:  yard  link.linear_unit
  subtype:  Gunter's_chain  a unit of length (22 yards)
  subtype:  engineer's_chain  a unit of length (100 ft)
  subtype:  nautical_chain  a nautical unit of length (15 ft)

No statement uses or specializes chain.linear_unit; click here to add one.