Constraints
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The framework allows devices to publish optional constraints for the models they implement.
There are three different levels of constraints:
- level 0: datatype constraints (provided through the NcDatatypeDescriptor)
- level 1: property constraints (provided through the NcPropertyDescriptor as part of an NcClassDescriptor)
- level 2: runtime constraints (provided as a property inside NcObject)
When using multiple levels of constraints implementations MUST fully override the previous level and this MUST not result in widening the constraints defined in previous levels (e.g. property constraints for a numeric property cannot increase the maximum beyond the maximum specified by the datatype constraints).
Below is a constraints diagram presenting a property called myProperty of type MyCustomType inside a MyCustomClass class.
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| Constraints levels |