Webel Twin Pattern: A «digital» DigitalEntity (a.k.a. @Entity) encapsulates strictly geometrical, spatial, and material aspects of a «physical» PhysicalEntity only. BY DEFINITION of this pattern it DOES NOT encapsulate processes!
Amongst other things, this policy helps leverage the separation of structure/value and Behavior in Systems Modeling Language v1 (SysML®), but there are also fundamental conceptual reasons for it.