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Элемент xsl:choose используется для организации выбора между несколькими возможностями.

Преобразование 1

Исходный XML

<source>

                  
<SECTION>
                  
     <DATA>I need a pen.</DATA>
                  
     <DATA>I need some paper.</DATA>
                  
     <SUMMARY>I need a pen and some paper</SUMMARY>
                  
</SECTION>
                  
<SECTION>
                  
     <DATA>I need bread.</DATA>
                  
     <DATA>I need butter.</DATA>
                  
</SECTION>
                  
                  

</source>

Результат

<P>SUMMARY: I need a pen and some paper</P>

<P>DATA: I need bread.</P>
<P>DATA: I need butter.</P>

Представление HTML

SUMMARY: I need a pen and some paper

DATA: I need bread.

DATA: I need butter.

Преобразование XSLT

<xsl:stylesheet version = '1.0' 
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

                  
<xsl:template match="//SECTION">
                  
     <xsl:choose>
                  
          <xsl:when test="SUMMARY">
                  
               <P>
                    <xsl:text>SUMMARY: </xsl:text>
                  
                    <xsl:value-of select="SUMMARY"/>
               </P>
                  
          </xsl:when>
                  
          <xsl:otherwise>
                  
               <xsl:for-each select="DATA">
                  
                    <P>
                         <xsl:text>DATA: </xsl:text>
                  
                         <xsl:value-of select="."/>
                    </P>
                  
               </xsl:for-each>
                  
          </xsl:otherwise>
                  
     </xsl:choose>
                  
</xsl:template>

                  

</xsl:stylesheet>