These are the rules that govern MoinMoin development:
All extensions to or modifications of the original WikiMarkup should be kept compatible and in the spirit of the OriginalWiki. Example: text shows up literally, i.e. no information is lost when cut&pasting to another Wiki.
Be portable at all times, at the very least to Win32 and Unix.
Keep the simple nature of PikiPiki's storage, if there are performance issues, add transparent caching / indexing.