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Turning the key on starts two behaviors, Driving and Braking. These behaviors execute until the key is turned off, using streaming parameters to communicate with other behaviors.

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OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Behavior
Parameter::isStreaming
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Turning the key on has a duration constraint specifying that this action lasts no more than 0.1 seconds.
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Turning the key on starts two behaviors, Driving and Braking. These behaviors execute until the key is turned off, using streaming parameters to communicate with other behaviors.
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The Driving behavior outputs a brake pressure continuously to the Braking behavior while both are executing, as indicated by the «continuous» rate and streaming properties (streaming is a characteristic of UML behavior parameters that supports ...
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Figure 11-10 shows a simplified model of driving and braking in a car that has an automatic braking system.
Parameters may also be marked as streaming (i.e., have the isStreaming property be true). Such Parameters allow values to be passed into and out of a Behavior execution any time during its course, rather than just on invocation and completion.
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