code: public static Descriptor createFromImplModelType(final Class<? extends Descriptor> implClass, String descriptorName)
          throws IllegalArgumentException {
          return DescriptorInstantiator.createFromImplModelType(implClass, descriptorName);
      }
docs: Creates a {@link Descriptor} instance from the specified implementation class name, also using the specified name
  
  @param implClass
  @param descriptorName
  @return
  @throws IllegalArgumentException
  If either argument is not specified