Editing Reification (computer science) (section)

== In Unified Modeling Language (UML) ==
[[File:reification example2.png|400px|thumb|The UML [[class diagram]] for the Membership example.]] [[Unified Modeling Language|UML]] provides an ''association class'' construct for defining reified relationship types. The association class is a single model element that is both a kind of association<ref>{{cite book
|chapter=Associations
|title=Unified Modeling Language 2.5.1
|series=[[Object Management Group |OMG]] Document Number formal/2017-12-05
|date=December 2017
|publisher=[[Object Management Group]] Standards Development Organization (OMG SDO)
|page=199
|url=https://www.omg.org/spec/UML/2.5.1/PDF
}}
</ref> and a kind of class.<ref name=OMG>{{cite book
|chapter=Classes
|title=Unified Modeling Language 2.5.1
|series=[[Object Management Group |OMG]] Document Number formal/2017-12-05
|date=December 2017
|publisher=[[Object Management Group]] Standards Development Organization (OMG SDO)
|page=194
|url=https://www.omg.org/spec/UML/2.5.1/PDF
}}
</ref> 
The association and the entity type that reifies are both the same model element. Note that attributes cannot be reified.