UML14 — OCL Standard package

Summary: resolving the issue of extensibility of OCL (like adding an operation to a
predefined
OCL type) I have written a new section in the OCL chapter. It describes
the
existence of a default package in each UML model, containing the predefined
OCL
types. I have chosen to name this package "UML_OCL" (or StandardOCL, ...).

Typically, the modeler will define its own OCL package (named e.g. MyOCL),
import
the standard OCL package (import UML_OCL) and extend the predefined OCL
types
to his/her liking. A like approach is taken in Catalysis.

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