code: public IScope createFeatureCallSerializationScope(EObject context) {
  		if (!(context instanceof XAbstractFeatureCall)) {
  			return IScope.NULLSCOPE;
  		}
  		XAbstractFeatureCall call = (XAbstractFeatureCall) context;
  		JvmIdentifiableElement feature = call.getFeature();
  		// this and super - logical container aware FeatureScopes
  		if (feature instanceof JvmType) {
  			return getTypeScope(call, (JvmType) feature);
  		}
  		if (feature instanceof JvmConstructor) {
  			return getThisOrSuperScope(call, (JvmConstructor) feature);
  		}
  		if (feature instanceof JvmExecutable) {
  			return getExecutableScope(call, feature);
  		}
  		if (feature instanceof JvmFormalParameter || feature instanceof JvmField || feature instanceof XVariableDeclaration || feature instanceof XSwitchExpression) {
  			return new SingletonScope(EObjectDescription.create(feature.getSimpleName(), feature), IScope.NULLSCOPE);
  		}
  		return IScope.NULLSCOPE;
  	}
docs: which is quite hard anyway ...