Bugzilla – Bug 807
switch MathML schema to http://www.w3.org/Math/RelaxNG/mathml3-restricted/
Last modified: 2011-01-07 13:57:00 CET
quoting http://www.w3.org/Math/RelaxNG/#mml3r mathml3-restricted is a version of the schema with all element and attribute names introduced at MathML3 removed (by applying the XSLT stylesheet included in the directory). This makes it usable as a schema for MathMl2, but benefitting from the stricter attribute typing specified in the MathML3 specifcation. It differs from MathML2 in some respects notably on the exact lists of attributes allowed on each element, as it follows MathML3 usage, however the similarity to MathML3 helps maintance, and may help users migrating from MathML2 to MathML3.
https://bitbucket.org/validator/validator/changeset/eb2b8dd89952