An actionable attribute is a model attribute with a modifier of "KnownBy" pointing to one or multiple Action(s). For example:
<String(name: name="Image" , KnownBy=: "SyncImage"/>)<
String name=: "State" , KnownBy=: "SyncImage,SyncPreset"/>)
An actionable attribute defines the active property of a ThingFacets or AppFacets.
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