Make a custom Domain
I want to build a custom domain (for a specific Structure template) , so I created a doctype which extends the docType “Domain”. But, when I do it, my new domain hasn't the same behavior as the basic version (it's just like a normal Superspace) and I can't, for example, publish documents in sections.
Is It possible to make a custom domain?
DocType extension inherits facets and schemas. Not the full behaviour.
In your case, you probably want to create a Structure template for your custom domain in which you recreate a sectionRoot for instance.