Описание тега xsl-choose
Tests multiple conditions in conjunction with the `<otherwise>` and `<when>` elements.
</when></otherwise>
The <xsl:choose> element is used in conjunction with <xsl:when> and <xsl:otherwise> to express multiple conditional tests.
If no <xsl:when> is true, the content of <xsl:otherwise> is processed.
If no <xsl:when> is true, and no <xsl:otherwise> element is present, nothing is created.
Syntax
<xsl:choose>
<!-- Content:(xsl:when+,xsl:otherwise?) -->
</xsl:choose>