rec-declare4

declare test (no visible rendering)

W3C sample	WIRIS
	$$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <declare type="fn">
    <ci>J</ci>
    <lambda>
      <bvar>
        <ci>x</ci>
      </bvar>
      <apply>
        <ln/>
        <ci>x</ci>
      </apply>
    </lambda>
  </declare>
</math>

Author: MathML 2 Recommendation