ThingModels and AppModels can inherit from model facets by using the keyword "combines".
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For example:
<ThingModel Name="TempSensor" combines="TempFacetSerial"/>
<ThingModel Name="TempHumidity" combines="TempFacetSerial, HumidityFacetSerial">
<Sid name="MySensorType" />
</ThingModel>
When a ThingModel combines ThingFacet, it will inherit all its attributes and actions.
Because only models can be instantiated, but not model facets, model facets must be combined into a model to be used in run time.
One model can combine one or more model facets.