The Math Working Group published the fourth draft of MathML version 3. Some more of the non-normative text has been removed in favor of a separate Primer. The presentation mark-up now allows the author to insert rendering hints in case the renderer has to insert extra line breaks. But most of the editorial effort has gone into defining the underlying semantics of content mark-up (chapter 4): it is now almost completely expressed in terms of OpenMath Content Dictionaries. That should not affect authors, but it enables software to convert between different math systems. Chapter 8 will eventually describe the structure of those Content Dictionaries. Comments on the draft are very welcome on the group's (archived) public mailing list, . There will be at least one more draft before the specification becomes Candidate Recommendation.

The charter of the Math Working Group expired earlier this year, and, after a few months' extension to determine the contents of the next charter, W3C decided to renew the charter until April 2010 without any changes to the work items. The updated schedule puts a Candidate Recommendation for MathML 3.0 at the end of 2008 and the group currently expects it can finish all its work, including all test suites, in early 2010. W3C Members can use a form to join the Working Group.