MOP

Meta Object Protocol(MOP) is a protocol for describing CLOS itself as an extensible CLOS program. In this description, the fundamental elements of CLOS programs (classes, slot definitions, generic functions, methods, specializers and method combinations) are represented by first-class objects. The behavior of CLOS is provided by these objects, or, more precisely, by methods specialized to the classes of these objects.

Because these objects represent pieces of CLOS programs, and because their behavior provides the behavior of the CLOS language itself, they are considered meta-level objects or metaobjects. The protocol followed by the metaobjects to provide the behavior of CLOS is called the CLOS Metaobject Protocol (MOP).

See also:

• A hypertext version of the The Common Lisp Object System MetaObject Protocol
• The MOP-standards-discussion for suggestions on MOP 2.0
• The MOP design patterns for some common patterns while using the MOP
• Open Implementations and Metaobject Protocols by Gregor Kiczales and Andreas Paepcke (recommended by Paolo Amoroso on comp.lang.lisp)

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