cd.attlist.OMS |= 
  attribute cd {string "relation0" },
  attribute name {
    string "relation" |
    string "reflexive" |
    string "irreflexive" |
    string "transitive" |
    string "symmetric" |
    string "antisymmetric" |
    string "partial_equivalence" |
    string "equivalence" |
    string "order" |
    string "strict_order" |
    string "pre_order" }