Is there special TexML syntax for key-value pairs

Question

Many TeX commands now work with key-value pairs, like this:

\mycommand{key1={myvalue},key2={othervalue}}

I can generate that sort of thing with TeXML (below), but it's ugly. Is there a better way?

<cmd name="mycommand">
  <parm>
    <TeXML escape="0">key1={</TeXML><xsl:value-of select="myselector1"/>
    <TeXML escape="0">},key2={</TeXML><xsl:value-of select="myselector2"/>
    <TeXML escape="0">}</TeXML>
    </parm>
</cmd>