PassiveTeX supports MathML directly. An XSL style sheet can pass <math> and its children through unchanged, as follows:
<xsl:template match="math"> <xsl:apply-templates mode="math"/> </xsl:template> <xsl:template mode="math" match="*|@*|comment()|processing-instruction()|text()"> <xsl:copy> <xsl:apply-templates mode="math" select="*|@*|processing-instruction()|text()"/> </xsl:copy> </xsl:template>
A reasonable subset of presentation MathML is recognized, and produces good output. We show an example later.