Editing Metaclass (section)

==Support in languages and tools==
The following are some of the most prominent [[programming language]]s that support metaclasses.
* [[Common Lisp]], via [[Common Lisp Object System|CLOS]]
* [[Delphi (programming language)|Delphi]] and other versions of [[Object Pascal]] influenced by it
* [[Groovy (programming language)|Groovy]]
* [[Objective-C]]
* [[Object REXX|ooRexx]]
* [[Python (programming language)|Python]]
* [[Perl]], via the metaclass pragma, as well as [[Moose (Perl)|Moose]]
* [[Ruby (programming language)|Ruby]]
* [[Smalltalk]]
* [[C++]] (proposed for a possible inclusion in future version of the standard)<ref>{{cite web|url=http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0707r0.pdf|title=Metaclasses|author=Herb Sutter|author-link=Herb Sutter}}</ref>
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Some less widespread languages that support metaclasses include [[OpenJava]], [[OpenC++ (software tool)|OpenC++]], [[OpenAda]], [[CorbaScript]], [[ObjVLisp]], [[Object-Z]], [[MODEL-K]], [[XOTcl]], and [[MELDC]]. Several of these languages date from the early 1990s and are of academic interest.<ref>{{Cite web |url=http://csl.ensm-douai.fr/noury/uploads/1/nouryBouraqadi.Gpce03WorkshopOnRepls.pdf |title=An implementation of mixins in Java using metaclasses |access-date=2007-11-27 |archive-url=https://web.archive.org/web/20071016230949/http://csl.ensm-douai.fr/noury/uploads/1/nouryBouraqadi.Gpce03WorkshopOnRepls.pdf |archive-date=2007-10-16 |url-status=dead }}</ref>

[[Logtalk]], an object-oriented extension of [[Prolog]], also supports metaclasses.

[[Resource Description Framework]] (RDF) and [[Unified Modeling Language]] (UML) both support metaclasses.