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Equations

Equation = ( ( Title, TitleAbbrev? )?,
             ( InformalEquation |
               ( Alt?, (Graphic+ | MediaObject+ ))
             )
           )

InformalEquation = ( Alt?, ( Graphic+ | MediaObject+ ) )

Elements : Equation, Title, TitleAbbrev, InformalEquation, Alt, Graphic, MediaObject.

<equation>
  <title>Is a title really necessary?</title>
  <alt>e = mc^2</alt>
  <mediaobject>
    <imageobject>
      <imagedata fileref="../figures/emc2.eps" format="eps">
    </imageobject>
    <imageobject>
      <imagedata fileref="../figures/emc2.gif" format="gif">
    </imageobject>
  </mediaobject>
</equation>