A new ContentHandler class as well as other modifications currently reside in the Wikidata branch here:
https://gerrit.wikimedia.org/r/#/q/status:merged+project:mediawiki/core+branch:Wikidata,n,z
This work needs to go through one or more review/iteration cycles, and then merged into master for deployment. This bug will be used to track the conversation and ownership. (Step 1: Tim will outline the steps that he believes need to happen prior to merge, which previously may have only been captured in IRC.)
Version: 1.20.x
Severity: normal