#bond_servant  someone bound to labor without wages
  supertype:  #slave  a person who is owned by someone
  subtype:  #bondman.bond_servant__bondsman  a male bound to serve without wages
  subtype:  #bondswoman__bondwoman__bondmaid  a female bound to serve without wages
  subtype:  #thrall  someone held in bondage
     subtype:  #serf__helot__villein  (medieval Europe) a person who is bound to the land and owned by the feudal lord
        subtype:  #cottier__cotter  a medieval English villein

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