Architecting and designing : UML 2.5 : Introduction to UML 2.5 : Enabling UML 2.5
  
Enabling UML 2.5
To turn on UML 2.5, complete these steps:
1 Select Tools > Customize Method Support (if you do not see this choice, click the expand arrow at the bottom of the Tools drop-down menu).
2 Select UML 2.5.
3 Click OK to close the dialog.
4 Reopen the encyclopedia to parse the properties and make UML 2.5 available.
UML 2.5 can be used jointly with other methods and Frameworks, such as TOGAF, BPMN, logical and physical data modeling, and so on.
You can use UML 2.5 with the prior version of UML that System Architect supports – UML 2.0 Lite – but it is not recommended. As the two metamodels are distinct, it would only serve to confuse you.
See also
UML 2.5 implementation in System Architect
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Introduction to UML 2.5