code: @Nonnull
    public JSDefinedClass _class (@Nonnull @Nonempty final String sName) throws JSNameAlreadyExistsException
    {
      final JSDefinedClass aDefinedClass = new JSDefinedClass (sName);
      return addDeclaration (aDefinedClass);
    }
docs: Add a class to this package.
  
  @param sName
  Name of class to be added to this package
  @return Newly generated class
  @exception JSNameAlreadyExistsException
  When the specified class/interface was already created.