I don't see any need for two concepts. Why not
ask the user
whether a new folder should be a sibling or a child, in the
same way the old version let's the user decide whether a new
name should represent a Folder, Glossary, Page or Resource?
Instead, ask "Child Folder, Sibling Folder, Glossary or Resource"?
"child glossary, sibling glossary, child resource, sibling resource".
I think the notion of asking "folder, page, resource" is ugly. I can't
think of a better general solution, though. My specific solution is to
allow the "anonymous" user to only create pages, and to make those pages
always be the sibling of other pages and the child of a folder. Only
advanced users will be allowed to create folders.
I have been thinking about what people have been saying on this list. I
found it hard to think why you could being saying the things you were, and
then I decided that your idea of a wiki was a tool for a few grad students.
My idea of a wiki is for a few thousand users, some of whom have no
experience with wikis. Simplicity is very important. I think you prefer
power to simplicity. That is reasonable for some audiences, but not for
mine.
-Ralph Johnson