The prefix rules: a title consists of an optional interwiki
prefix (such as "m:" for meta or "de:" for German), followed
by an optional namespace, followed by the remainder of the
-title. Both Interwiki prefixes and namespace prefixes have
+title. Both interwiki prefixes and namespace prefixes have
the same rules: they contain only letters, digits, space, and
underscore, must start with a letter, are case insensitive,
and spaces and underscores are interchangeable. Prefixes end