xslt - Exists function in XSL When Statement -

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i using xsl when clause transform 1 xml file xml file. need use "exists" function in when test.

here's example source xml:

<people>     <person personid="1" location="us" fullname="john doe"/>     <person personid="2" location="us" fullname="jane doe"/> </people> <nicknames>     <nickname personid="1" nname="johnny d"/> </nicknames>

here's example xsl:

  <xsl:element name="hasnickname">     <xsl:choose>         <!-- if nickname exists in source xml, return true -->       <xsl:when test="boolean exists function"         <xsl:text>true</xsl:text>       </xsl:when>       <xsl:otherwise>         <xsl:text>false</xsl:text>       </xsl:otherwise>     </xsl:choose>   </xsl:element>

can exists part?

suppose variable $personid contains @personid of person checking, checks existence:

<xsl:when test="boolean(//nickname[@personid=$personid]/@nname)">

for similar issues prefer check non-empty/non-whitespace value:

<xsl:when test="normalize-space(//nickname[@personid=$personid]/@nname)!=''">

if use key <xsl:key name="nn" match="//nickname" use="@personid"/>, following possible:

<xsl:when test="normalize-space(key('nn',$personid)/@nname)!=''">

the latter not need $personid variable can directly work @personid of person checking…


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