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It is a stereotype ?«itemFlow?» of the UML element information flow.
An UML information fl ow describes only abstract types??”information that fl ows
between two elements. SysML extends the information fl ow by a way to use connectors
in the internal block diagram to describe the fl ow of specifi c objects. The
fl owing object is a property defi ned in the context of the block. While the fl ow
port describes the objects that can fl ow there, the item fl ow describes what really
fl ows.
You can see in Figure 4.41 that the object water of type H 2 O fl ows from the
atomic fl ow port of a container, a , to the atomic fl ow port of a pump. The fl ow
ports specify more generally that liquids can fl ow through them.
4.5.7 Association Block
FIGURE 4-41
Example for an item fl ow.
ibd [block] Pump system [example SysML book]
a:Container
:Liquid
b:Container
:Liquid
:Pump
:Liquid
:Liquid
Water:H2O
Water:H2O
Defi nitions
An association block describes the structural properties of an association.
It is the SysML name for the UML element association class.


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