C. Scott Ananian and Subbu Sastry from the Wikimedia Foundation provide an overview of Parsoid, a Wikimedia technology that supports HTML to wikitext (and vice versa) translation, supporting rich annotated output markup for translation layers and other clients (e.g., Wikipedia related technology) to more specifically query elements from wiki content.

You may have caught some of this material at Wikimania, or maybe this is your first time. In any event, it's good stuff! This was an interactive session with questions from Wikimedia Reading Engineering.