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Metaobject Protocol

The Metaobject Protocol is a programming language feature that enables introspection, reflection, and modification of the structure and behavior of objects within an object-oriented framework. The protocol was introduced in the context of the Common Lisp Object System (CLOS) but has since influenced other languages. It provides a way to customize or extend core language constructs and standard libraries from within the language itself, rather than resorting to external code generators or pre-processors. By employing metaobjects — objects that represent other objects at a higher level — developers can intervene in method dispatching, class creation or instantiation processes without altering existing code directly. This approach facilitates abstraction, increases flexibility in system design while maintaining type safety and helps reduce code duplication by allowing for more dynamic programming patterns.