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The SEDRIS Data Representation Model
APPENDIX A - Classes State Control Link |
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An instance of this DRM class specifies an <Expression> instance that determines the active_state_value of all target state related aggregation instances, and specifies how the targets are to behave if the resulting active_state_value does not match the <State Data> link object of any branch within a given target.
Consider a <State Related Features> instance representing the topology of a road, where the road crosses bridges that can be destroyed and has segments that can be washed out by flooding. The active state of the road (that is, how much damage it has actually suffered) is a variable, determined by some combination of environmental conditions (such as amount of precipitation or whether a nearby dam has collapsed). Consequently, the <State Related Features> instance has a <State Control Link> component that specifies a <Variable> instance that controls the active_state_value of the <State Related Features> instance.
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| SE_String | description; | 1 |
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| SE_Integer_Positive | expression_index; | 2 |
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| SE_State_Mismatch_Behaviour | mismatch_behaviour; | 3 |
The description field specifies a text description of the purpose of the <Control Link> instance.
The expression_index field specifies which <Expression> component controls the active_state_value field of the target state related aggregate(s).
The mismatch_behaviour field specifies how the active_state_value is to be set when the specified controlling <Expression> component evaluates to a state value that does not correspond to the <State Data> link object of any branch within the target state related aggregate(s).
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