Is there a way for me to output the contents of <MyPre> "as-is" including
  the tags contained within?


XSLT manipulates a tree of nodes, it has no direct access to the tags,
you want to copy all the child nodes of MyPre to teh result so that's

<xsl:template match="MyPre">
  <xsl:copy-of select="node()"/>
</xsl:template>

David

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