xsl:choose ... xsl:when ... xsl:otherwise

Conditionally process a part of the template, allowing alternatives.

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template name="test">
    <xsl:choose>
      <xsl:when test="@test='1'">
        ...
      </xsl:when>
      <xsl:when test="@test='2'">
        ...
      </xsl:when>
      <xsl:otherwise>
        ...
      </xsl:otherwise>
    </choose>
  </xsl:template>
</xsl:stylesheet>
					

The test attribute value always expects a boolean result, the value is converted to a boolean as if by a call to the XPath boolean function.