rec-declare5

declare test (no visible rendering)

W3C sample	WIRIS
	$v 123$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <declare>
    <ci>v</ci>
    <vector>
      <cn>1</cn>
      <cn>2</cn>
      <cn>3</cn>
    </vector>
  </declare>
</math>

Author: MathML 2 Recommendation