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>
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