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Unified Modeling Language™ (UML®)

NOTE:  There are no XSD files associated with Version 2.0

The current version is found at

OMG Formal Versions of UML®

Version Release Date


2.5 June 2015
2.4.1 August 2011
2.4 March 2011
2.3 May 2010
2.2 February 2009

November 2007


August 2007

Please note that version 2.1 was never released as a formal specification.


July 2005
combines v1.4 and action semantics
March 2003
1.4 September 2001
1.3 March 2000


iSO Release Information

ISO Release Information UML Version Format URL

This version (2.4.1) has been formally published by ISO as the 2012 edition standard: ISO/IEC 19505-1 and 19505-2.

2.4.1 PDF


This version (1.4.2) has been formally published by ISO as the 2005 edition standard: ISO/IEC 19501

1.4.2 PDF

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