How to add a new type of Task with another namespace

I need to create a new type of Task, but with a different namespace (eg. “apk: actionTask”). Appearance and behavior of this element must be similarly “bpmn:Task”. Tell me please

Does not work. Must be bpmn:XXX for BPMN 2.0 XML schema compliance reasons.

If you are a bit more specific on what you’d like to do and why, we may be able to give you further assistance.