Hi all!
As discussed last week with Rob, I have no prepared a merge request that introduces the ContentHandler into MediaWiki core. This is a major building block for the Wikidata project. I hope the merge will be completed soon, since this will grow stale fast.
The merge request is here: https://gerrit.wikimedia.org/r/27194
Since Gerrit doesn't show nice diffs for merges, here's a squashed version: https://gerrit.wikimedia.org/r/27191
Please let us know very soon if there are any serious problems. The branch has been reviewed before, and I resolved several remaining issues over the last days, so I hope there are no more big issues left.
-- daniel