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?–  Two new diagram types: requirement diagram and parametric diagram.
?–  Support of the neutral ISO AP-233 data format for exchanging data between
different tools.
?–  Explicit omission of UML elements that are not needed in systems engineering,
e.g., software-specifi c components.
The question whether these extensions were necessary at all is justifi ed, or
in other words: ??? Why yet another modeling language? ??? The answer is that, though
UML is quite a mighty language, it has some shortcomings with regard to systems
engineering, such as a lack of requirement modeling. Another reason for the need
of SysML is the fact that UML is rather software-specifi c and strongly characterized
by object orientation, while modeling in systems engineering is interdisciplinary.
The use of UML can easily lead to acceptance problems and misunderstandings
when in interdisciplinary communication.
6 I use ??? UML 1 ??? and ??? UML 2 ??? for UML Versions 1. x and 2. x in the further course of this book. If I
mean a specific version, I will write it fully, e.


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