XSL: Get variable data without exslt:node-set

Using native XSL lib in PHP. Is it possible to get a node value inside a variable without having t开发者_运维百科o call it through exslt:node-set every time.... it long and ugly.

<xsl:variable name="mydata">
    <foo>1</foo>
    <bar>2</bar>
</xsl:variable>


<!-- How currently being done -->
<xsl:value-of select="exslt:node-set($mydata)/foo" />


<!-- I want to be able to do this -->
<xsl:value-of select="$mydata/foo" />

---

<xsl:variable name="mydata">
 <foo>1</foo>
 <bar>2</bar>
</xsl:variable>

<!-- How currently being done -->
<xsl:value-of select="exslt:node-set($mydata)/foo" />

<!-- I want to be able to do this -->
<xsl:value-of select="$mydata/foo" />

If the contents of the variable is statically defined, then it is possible to access it from an XPath expression without the use of the xxx:node-set() extension function.

Example:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:variable name="mydata">
  <foo>1</foo>
  <bar>2</bar>
 </xsl:variable>

 <xsl:template match="/">
  <xsl:value-of select=
   "document('')/*/xsl:variable[@name='mydata']/bar"/>
 </xsl:template>
</xsl:stylesheet>

when this transformation is applied on any XML document (not used), the wanted, correct result is produced:

2

---

It's possible to call node-set just once. Convert the variable into a node-set type:

<!-- do it once at the beginning -->
<xsl:variable name="mydatans" select="exslt:node-set($mydata)" />
<!-- anytime you need: -->
<xsl:value-of select="$mydatans/foo" />