Architecting and designing : UML 2.5 : Introduction to UML 2.5
  
Introduction to UML 2.5
The Unified Modeling Language (UML) is a standard general-purpose modeling notation for object-oriented analysis and design of systems.
System Architect currently supports the following versions of UML, that are separate and distinct:
UML 2.0 Lite
which is based on the UML 2 metamodel. For details, see UML 2.0 Lite.
UML 2.5
which provides a detailed implementation of the UML 2.5 specification.
It is strongly suggested you choose to use one or the other – not both. They are distinctly different metamodel implementations; turning both on would only serve to confuse you.
See
Enabling UML 2.5
UML 2.5 implementation in System Architect
See also
Package views
Diagram views
Model Elements
Relationships
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UML 2.5