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Perhaps a more realistic example. Simply strip the markup in richTitle and you'd be left with "The story of 1: an imaginary tale."

<titleInfo>
  <nonSort>The </nonSort>
  <title>story of √(−1)</title>
  <subTitle>an imaginary tale</subTitle>
<titleInfo>
<extension xmlns:m="http://www.w3.org/1998/Math/MathML">
  <richTitle xmlns="http:whatever>The story of
    <m:math>
      <m:apply>
        <m:root/>
        <m:apply>
          <m:minus/>
          <m:cn>1</m:cn>
        </m:apply>
      </m:apply>
    </m:math>: an imaginary tale</richTitle>
</extension>