mathml.spad line 290 [edit on github]
MathMLFormat provides a coercion from OutputForm to MathML format.
coerce(o)
changes o
in the standard output format to MathML format.
coerceL(o)
changes o
in the standard output format to MathML format and displays result as one long string.
coerceS(o)
changes o
in the standard output format to MathML format and displays formatted result.
prints the string returned by coerce, adding <math ...> tags.