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=== State and objects ===
It is again possible to extend the declarative model to support state and [[object-oriented programming]] with very simple semantics. To create a new mutable data structure called Cells:
<syntaxhighlight lang="erlang">
local A X in
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</syntaxhighlight>
With these simple semantic changes, the whole object-oriented paradigm can be supported. With a little [[syntactic sugar]], OOP becomes well integrated in Oz.
<syntaxhighlight lang="
class Counter
attr val
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