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<h1>xsl:when</h1>
<p>The <code>xsl:when</code> element is used within an <code>xsl:choose</code> element to indicate one
of a number of choices. It takes a mandatory parameter, <code>test</code>, whose value is a match
pattern. If this is the first xsl:when element within the enclosing xsl:choose whose test
condition matches the current element, the content of the xsl:when element is expanded, otherwise
it is ignored.</p>
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