@InCollection{Kleppe:2002:inOCL,
  author =       "Anneke Kleppe and Jos Warmer",
  title =        "The Semantics of the {OCL} Action Clause",
  booktitle =    "Object Modeling with the OCL: The Rationale behind the
                  Object Constraint Language",
  publisher =    "Springer",
  year =         "2002",
  editor =       "Tony Clark and Jos Warmer",
  pages =        "213--227",
  isbn =         "3-540-43169-1",
}