CPP11 — 20.17.9 Valuetype Inheritance

Summary: For an IDL valuetype derived from other valuetypes or that supports
interface types, several C++ inheritance scenarios are possible:
...

• Interface classes supported by the IDL valuetype are not inherited. Instead,
  the operations on the interface (and base interfaces, if any) are mapped to
  pure virtual functions in the generated C++ base value class. In addition to
  this abstract base value class and the OBV_ class, the IDL compiler generates
  a POA skeleton for this value type; the name of this skeleton is formed by
  prepending the string "POA_" to the fully-scoped name of the valuetype. The
  base value class and the POA skeleton of the interface type are public virtual
  base classes of this skeleton.

Consider this example:

// IDL
interface I {};
abstract valuetype A supports I {};
valuetype B : A {};

Is a POA skeleton generated for A? Is one generated for B?