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& specifi es the action subject to time measurement.
t , s , sms1 , and sms2 are local attributes of the interaction. They are declared in
the upper area of the diagram (  name  :  Type 
).
If you need more possibilities to model time aspects, you can use the concepts
of the standardized UML Profi le for Modeling and Analysis of Real-Time
and Embedded ( MARTE ) systems 19 [49]. This profi le was created for the development
of real-time and embedded systems, but it can also be used in systems
engineering.
3.9 The Package Diagram
Most models quickly reach a number of model elements that makes it necessary
to somehow structure them, even for small systems. Similar to how directories
group files on the hard disk, packages take care of structures in models. The
grouping criterion is not explicitly modeled; it is up to the modeler to decide. The
package diagram shows the packages and their relationships.
3.9.1 Package
A package groups model elements and forms a namespace.
In addition for forming groups, a package forms a namespace as well.


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