get xpath from xsl variable

Question

I am trying to get some xpath from xsl variable using xsl ver 1.0 . That’s my variable:

  <xsl:variable name ="myVar">
        <RefData RefTag="test1" bbb="false" />
        <RefData RefTag="test2" bbb="false" />
        <RefData RefTag="test3" bbb="false" />
        <RefData RefTag="test4" bbb="true"  />
        <RefData RefTag="test5" bbb="false" />
        <RefData RefTag="test6" bbb="false" />
  </xsl:variable>

I am trying to get bbb attribure value using the RefTag value:

<xsl:if test="$myVar/RefData[@RefTag = 'test3']/@bbb">

this is not working.

VS XSL Debugger returns an error: "To use a result tree fragment in a path expression, first convert it to a node-set using the msxsl:node-set() function."

I don't understand how to use msxsl:node-set() function, and anyway I prefer not to use msxsl namesapce.

Can anyone help here?

Answer 1

<xsl:variable name="myVariable" select="msxsl:node-set($myVar)"/>

You can avoid msxsl namespace by moving variable contents to the source xml.

Answer 2

Assuming this XML:

<test1>
  <RefData RefTag="test1"/>
  <RefData RefTag="test2"/>
  <RefData RefTag="test3"/>
  <RefData RefTag="test4"/>
  <RefData RefTag="test5"/>
  <RefData RefTag="test6"/>
</test1>

Something like this could work:

<xsl:template match="/">
  <xsl:apply-templates select="test1/RefData"/>
</xsl:template>

  <xsl:template match="RefData">
    <xsl:variable name="myVar">
      <xsl:choose>
        <xsl:when test="@RefTag = 'test1'">false</xsl:when>
        <xsl:when test="@RefTag = 'test2'">false</xsl:when>
        <xsl:when test="@RefTag = 'test3'">false</xsl:when>
        <xsl:when test="@RefTag = 'test4'">true</xsl:when>
        <xsl:when test="@RefTag = 'test5'">false</xsl:when>
        <xsl:when test="@RefTag = 'test6'">false</xsl:when>
        <xsl:otherwise>true</xsl:otherwise>
      </xsl:choose>
    </xsl:variable>
    <!--<text x="{$myVar}"/>-->
  </xsl:template>

Answer 3

One solution that doesn't need the xxx:node-set() extension is the following:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt;
 <xsl:output method="text"/>
 <!--                                           -->
    <xsl:variable name ="myVar">
     <RefData RefTag="test1" bbb="false" />
     <RefData RefTag="test2" bbb="false" />
     <RefData RefTag="test3" bbb="false" />
     <RefData RefTag="test4" bbb="true"  />
     <RefData RefTag="test5" bbb="false" />
     <RefData RefTag="test6" bbb="false" />
    </xsl:variable>
 <!--                                           -->
    <xsl:variable name="vrefVar" select=
     "document('')/*/xsl:variable[@name='myVar']"
     />
 <!--                                           -->
    <xsl:template match="/">
      <xsl:value-of select="$vrefVar/*[@RefTag='test3']/@bbb"/>
    </xsl:template>
</xsl:stylesheet>

When the above transformation is applied on any XML document (not used), the wanted result is produced:

false

Do note the use of the XSLT document() function in order to access the required <xsl:variable> simply as an element in an xml document.