NestedPrimitiveAssertion na = (NestedPrimitiveAssertion)a;
NestedPrimitiveAssertion nb = (NestedPrimitiveAssertion)b;
Intersector intersector = new Intersector(assertionBuilderRegistry);
Policy nested = intersector.intersect(na.getNested(), nb.getNested());
if (null == nested) {
return null;
}
NestedPrimitiveAssertion compatible =