Editing Unified Modeling Language (section)

=== UML 2 ===
UML 2.0 major revision replaced version 1.5 in 2005, which was developed with an enlarged consortium to improve the language further to reflect new experiences on the usage of its features.<ref>{{cite web|url=http://www.omg.org/spec/UML/2.0/ |title=UML 2.0 |publisher=Omg.org |access-date=2011-09-22}}</ref>

Although UML 2.1 was never released as a formal specification, versions 2.1.1 and 2.1.2 appeared in 2007, followed by UML 2.2 in February 2009. UML 2.3 was formally released in May 2010.<ref name="spec">{{cite web|url=http://www.omg.org/spec/UML/ |title=UML |publisher=Omg.org |access-date=2011-09-22}}</ref> UML 2.4.1 was formally released in August 2011.<ref name="spec" /> UML 2.5 was released in October 2012 as an "In progress" version and was officially released in June 2015.<ref name="spec" />
The formal version 2.5.1 was adopted in December 2017.<ref name="OMG" />

There are four parts to the UML 2.x specification:

* The Superstructure that defines the notation and semantics for diagrams and their model elements
* The Infrastructure that defines the core metamodel on which the Superstructure is based
* The [[Object Constraint Language]] (OCL) for defining rules for model elements
* The UML Diagram Interchange that defines how UML 2 diagram layouts are exchanged

Until UML 2.4.1, the latest versions of these standards were:<ref name="Versions2.4.1">{{cite web|author=OMG|title=OMG Formal Specifications (Modeling and Metadata paragraph)|url=http://www.omg.org/spec/#M&M|access-date = 2016-02-12}}</ref>
* UML Superstructure version 2.4.1
* UML Infrastructure version 2.4.1
* OCL version 2.3.1
* UML Diagram Interchange version 1.0.
Since version 2.5, the UML Specification has been simplified (without Superstructure and Infrastructure), and the latest versions of these standards are now:<ref name="LatestVersions">{{cite web|author=OMG|title=about the unified modeling language specification|url=https://www.omg.org/spec/UML/About-UML/|access-date = 2020-02-22}}</ref>

* UML Specification 2.5.1
* OCL version 2.4

It continues to be updated and improved by the revision task force, who resolve any issues with the language.<ref>{{cite web |title=Issues for UML 2.6 Revision task Force mailing list |url=https://issues.omg.org/issues/lists/uml2-rtf |access-date=2014-04-10 |publisher=Omg.org}}</ref>