2010/8/2 Gerard Meijssen <gerard.meijssen(a)gmail.com>om>:
Hoi,
The big problem with upgrading MediaWiki is the upgrading of extensions. It
is not documented anywhere if extensions will work with a specific release
of MediaWiki. Being able to install extensions is a great thing when you
know upfront that the extensions you are interested in will actually work
and not crash your installation.
We branch and tag extensions along with versions
of MediaWiki, so the
code found at
http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_15_5/extensions/
is supposed to work with MW 1.15.5. However, this assumes that the
trunk version of each extension worked with the trunk version of MW at
the time of the branch point, which is not always the case and is the
responsibility of the extension maintainer. Versioned releases can
also be downloaded through ExtensionDistributor at
mediawiki.org,
although ED breaks all the time and we've been getting lots of
questions in #mediawiki from people whose wiki broke because they
installed the trunk version of ParserFunctions (downloaded through ED)
with MediaWiki 1.15.
Roan Kattouwv (Catrope)