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Can I have a site wide "Main_masterpage",

and create a second "Sub_Group_of_pages_masterpage",
whose masterpage is "Main_masterpage"?

"Sub_Group_of_pages_masterpage"
inherits from "Main_masterpage"
and then adds to it.

reasonable and allowed?

Reasonable, but not allowed. I asked that question earlier.

Alan

Simply use the sub_group 'master pages' as embedded pages in the pages that use the main master page.

the plan-

masterpages covers most pages.
I want to add additional master features to a small subset of pages.
so submaster uses masterpage, as do most pages.

the smaller set uses submaster as their master page,
and should inherit 'masterpage' via submaster.

it seems the problem is that both masterpages have an unchangable id
which I am not allowed to change. if I could, I would not see the error message.

I will try the embedded idea, but it should not be required,
if the only problem is that masterpage ids conflict,
no matter what they are named.

I'm sorry, master pages cannot be nested.
The master page only has an ID during design-time (because it's basically a full screen embedded page).
When it is published, the content will be merged with the content page.

understood, but it would be so nice if they could be nested and merged.

thanks.