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Samuel H. Valentine, Ian Toyn, Susan Stepney, and Steve King
Type-constrained Generics for Z.

In Jonathan P. Bowen, Steve Dunne, Andy Galloway, Steve King, editors, ZB2000: First International Conference of B and Z Users, York, UK, August 2000 . Volume 1878 of Lecture Notes in Computer Science, pp 250--263. Springer, 2000.

Abstract:

We propose an extension to Z whereby generic parameters may have their types partially constrained. Using this mechanism it becomes possible to define in Z much of its own schema calculus and refinement rules.

Full paper : PDF 192K 

@inproceedings(SS-ZB2000d,
  author = "Samuel H. Valentine and Ian Toyn and Susan Stepney and Steve King",
  title = "Type-constrained Generics for Z",
  pages = "250--263",
  crossref = "ZB2000"
)

@proceedings(ZB2000,
  title = "ZB2000: First International Conference of B and Z Users,
           York, UK, August 2000",
  booktitle = "ZB2000: First International Conference of B and Z Users,
               York, UK, August 2000",
  editor = "Jonathan P. Bowen and Steve Dunne and Andy Galloway and Steve King",
  series = "LNCS",
  volume = 1878,
  publisher = "Springer",
  year = 2000
)