XSLT split a string into items

splitStringToItems.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl"
>
  <xsl:output method="xml" indent="no"/>
  <xsl:variable name="groups" select="'265, 256'" />

  <xsl:template match="root">
    <xsl:variable name="items">
      <xsl:call-template name="splitStringToItems">
        <xsl:with-param name="delimiter" />
        <xsl:with-param name="list" select="$groups" />
      </xsl:call-template>
    </xsl:variable>
    <xsl:if test="msxsl:node-set($items)/item[text()='256']">
      You are a member of group 256
    </xsl:if>
  </xsl:template>

  <xsl:template name="splitStringToItems">
    <xsl:param name="list" />
    <xsl:param name="delimiter" select="','"  />
    <xsl:variable name="_delimiter">
      <xsl:choose>
        <xsl:when test="string-length($delimiter)=0">,</xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="$delimiter"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:variable>
    <xsl:variable name="newlist">
      <xsl:choose>
        <xsl:when test="contains($list, $_delimiter)">
          <xsl:value-of select="normalize-space($list)" />
        </xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="concat(normalize-space($list), $_delimiter)"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:variable>
    <xsl:variable name="first" select="substring-before($newlist, $_delimiter)" />
    <xsl:variable name="remaining" select="substring-after($newlist, $_delimiter)" />
    <item>
      <xsl:value-of select="$first" />
    </item>
    <xsl:if test="$remaining">
      <xsl:call-template name="splitStringToItems">
        <xsl:with-param name="list" select="$remaining" />
        <xsl:with-param name="delimiter" select="$_delimiter" />
      </xsl:call-template>
    </xsl:if>
  </xsl:template>
</xsl:stylesheet>

This XSLT document contains a template which can split the content of a string into a collection of items.
If you for instance have a string: "265, 256" you will get a collection like this:
<item>265</item>
<item>256</item>