Definition :
The Object Constraint Language is a declarative language describing rules applying to Unified Modeling Language models developed at IBM and is now part of the UML standard. Initially, OCL was merely a formal specification language extension for UML.
Further Reading :
Book : Applying UML and Patterns by Craig Larman.
Definition :
The Law of Demeter or principle of least knowledge is a design guideline for developing software, particularly object-oriented programs. In its general form, the LoD is a specific case of loose coupling.
Further Reading :
Book : Applying UML and Patterns by Craig Larman.
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