Requests for comment/Foreign namespaces

Currently MediaWiki supports having a "foreign file repo", in which files are pulled from a remote wiki, either via a local database connection or the API. This is a useful feature, and has more applications than just files. There are applications for at least these core namespaces:


 * Template namespace - Global templates (bug ???)
 * User namespace - Global user pages (bug 14759)
 * Help namespace - documentation on all wikis pulled from mw.o (see also Extension:HelpPages)