How can make an XSLT Javascript extension function return a node-set?

Is there a simple way to have an extension function in XSLT 1.0 written in javascript return a node-set?
I could create a new java class for this, but I would rather just put some code in the script itself.
When this can be done in another scripting language supported by all or most XSLT processors (VB script? Groovy? C#?), then that's OK too of course.

I have the following simple script:

<msxsl:script language="JScript" implements-prefix="custom">
    function xml (input) {
        var x = input.split(";");
        return x.toString();
    }
</msxsl:script>

which returns a string, and hence no problem calling the function in Xpath expressions.
What I would like to have, is a node-set result. But when I change my script to

<msxsl:script language="JScript" implements-prefix="custom">
    function xml (input) {
        var x = input.split(";");
        return x;
    }
</msxsl:script>

then calling the function gives an error because the array is not automatically converted to a node-set.

I looked at arrays-with-java-xslt-extensions but that's more in the line of creating a new class for this, which I wish to avoid for now.

So which statements should be added to the script in order to transform the array into a node-set, allowing the function call to be used in Xpath expressions?

Solution

Here is an example that should work with MSXML 6 as long as run in a mode allowing script in XSLT to implement extension functions. The stylesheet code is as follows:

<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0"
  xmlns:ms="urn:schemas-microsoft-com:xslt"
  xmlns:my="http://example.com/my"
  exclude-result-prefixes="ms my">

  <xsl:output method="html" version="5.0"/>

  <ms:script language="JScript" implements-prefix="my">
  <![CDATA[
  function tokenize (input) {
    var doc = new ActiveXObject('Msxml2.DOMDocument.6.0');
    var fragment = doc.createDocumentFragment();
    var tokens = input.split(';');
    for (var i = 0, l = tokens.length; i < l; i++)
    {
      var item = doc.createElement('item');
      item.text = tokens[i];
      fragment.appendChild(item);
    }
    return fragment.selectNodes('item');
  }
  ]]>
  </ms:script>

  <xsl:template match="/">
    <html>
      <head>
        <title>Example</title>
      </head>
      <body>
        <h1>Example</h1>
        <ul>
          <xsl:apply-templates select="my:tokenize('Kibology;for;all')"/>
        </ul>
      </body>
    </html>
   </xsl:template>

   <xsl:template match="item">
     <li>
       <xsl:value-of select="."/>
     </li>
   </xsl:template>

</xsl:stylesheet>