Juanma Barranquero wrote:
AFAICS, MediaWiki:Booksources contains the name of a page in the {{ns:4}} namespace, which is used verbatim, except that MAGICNUMBER is substituted by the ISBN.
Nice, though not the most documented of features :)
It predates the editable MediaWiki: messages, so yeah it's a little ugly. Could use some cleanup.
-- brion vibber (brion @ pobox.com)