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      <h1>Conditional Expressions</h1>
      <p>XPath 2.0 allows a conditional expression of the form <code>if ( E1 ) then E2 else E3</code>.
For example, <code>if (@discount) then @discount else 0</code> returns the value of the <code>discount</code>
attribute if it is present, or zero otherwise.</p>
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