uc [package] SysML book [system process notation]
System process System process ?«systemProcess?»
System process
Defi nitions
An information item is an abstract UML concept used to model the existence
and transmission of information on a rough level.
An information fl ow is a directed relationship between actors, use cases,
classes, ports, roles, interfaces, or packages. The relationship expresses that
information can be exchanged between these elements.
The information flow concept is the data flow modeling of UML. This concept had
been introduced in UML 2. UML 1 lets you model the flowing of data only implicitly,
for example, as messages in sequence diagrams, or as object flows in activity
diagrams. However, these levels are rather concrete, requiring a view onto the system
that are rich in details. Seen on a more abstract level, the exchange of messages
between objects could be an exchange of information between actor and
use case. From this perspective, the information flow is to be understood as a kind
of comment that reflects a concrete detailed exchange of data on a coarser level.
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