I want to create a type of task topic that contains an element that the DITA model task topic does not seem to have. My first thought is to start with a task topic and specialize it to contain the new element. But then I read that a specialization must be more restrictive than its parent.  So if I want to add a new element that does not exist in the parent task topic, does that mean I have to create a specialization at the same level as the model DITA task topic instead of as a child of the DITA task topic?