m:annotation-xml, m:apply, m:bind, m:cerror, m:condition, m:degree, m:domainofapplication, m:interval, m:lambda, m:list, m:logbase, m:lowlimit, m:matrix, m:matrixrow, m:momentabout, m:otherwise, m:piece, m:semantics, m:set, m:uplimit and m:vector
This element may contain text.
This element may contain the following children: m:maction, m:maligngroup, m:malignmark, m:menclose, m:merror, m:mfenced, m:mfrac, m:mglyph, m:mi, m:mlongdiv, m:mmultiscripts, m:mn, m:mo, m:mover, m:mpadded, m:mphantom, m:mroot, m:mrow, m:ms, m:mspace, m:msqrt, m:mstack, m:mstyle, m:msub, m:msubsup, m:msup, m:mtable, m:mtext, m:munder and m:munderover
http://www.w3.org/1998/Math/MathML