ement is used to choose one of a number of alternative outputs. The element
typically contains a number of <a href="#xsl:when">xsl:when</a> elements, each with a separate test condition. The first
xsl:when element whose condition matches the current element in the source document is expanded, the others
are ignored. If none of the conditions is satisfied, the <a href="#xsl:otherwise">xsl:otherwise</a> child element, if any, is
expanded.</p>

<p>The test condition in the xsl:when element is a boolean e