<equation>
  <title>Fermat's Last Theorem</title>
  <alt>x^n + y^n ≠ z^n ∀ n ≠ 2</alt>
  <mathphrase>
    x<superscript>n</superscript>+y<superscript>n</superscript>≠z<superscript>n</superscript>
    ∀ n ≠ 2
  </mathphrase>
</equation>

<informalequation>
  <alt>e^(pi*i) + 1 = 0</alt>
  <mediaobject>
    <imageobject condition="print"><imagedata fileref="figs/print/db5d_refeqn02.pdf"/></imageobject>
    <imageobject condition="web"><imagedata fileref="figs/web/db5d_refeqn02.png"/></imageobject>
  </mediaobject>
</informalequation>	
	
	

		
<para>
A presentation system using TeX as a back end might allow you to insert inline markup, such as <markup role="tex">$x^2$</markup>, using TeX syntax directly.
</para>