W3C:

2008-04-09: The Math Working Group has published a Working Draft of Mathematical Markup Language (MathML) Version 3.0. This is the third draft of MathML, an XML application for describing mathematical notation and capturing both its structure and content. The goal of MathML is to enable mathematics to be served, received, and processed on the World Wide Web, just as HTML has enabled this functionality for text. Learn more about the Math Activity. (Permalink)