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Its key features include syntactic simplicity, similarity with Java [8], strong static typing, pure object abstraction, and some dynamic mechanism which are normally only found in dynamic languages.\n            <jats:italic>Z<\/jats:italic>\n            <jats:sub>0<\/jats:sub>\n            provides a unified, object-oriented treatment of all values, primitive, user-defined, and even control structures. In a nutshell, everything is an object. As far as object \"purity\" is concerned,\n            <jats:italic>Z<\/jats:italic>\n            <jats:sub>0<\/jats:sub>\n            looks to Smalltalk [6] and Self [20,17].\n            <jats:italic>Z<\/jats:italic>\n            <jats:sub>0<\/jats:sub>\n            uses a clean and strict method-based model. There are no explicit instance variables, only methods. A dynamic, compile-time checkable method update mechanism is provided to make methods manipulable at run time. Inheritance model is simple and straightforward. 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