XSLT: How to split strings for multiple fields simultaneously

I've seen a number of posts about using tokenize() to split strings, but they all involve a single field. I have a slightly different situation and I'm not sure how to approach it.

My XML can resemble something like this:

<somefield>
    <code>A,B,C</code>
    <description>Description of A; Description of B; Description of C</description>
</somefield>

I want to transform that into something like this:

{
  "somefield": [
    {
      "code": "A",
      "description": "Description of A"
    },
    {
      "code": "B",
      "description": "Description of B"
    },
    {
      "code": "C",
      "description": "Description of C"
    }
  ]
}

I don't quite see how to split both fields simultaneously like that. Any ideas?

In XSLT 2.0 you could do something like

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>

<xsl:template match="/somefield">
    <array key="somefield">
        <xsl:variable name="descr" select="tokenize(description, ';')"/>
        <xsl:for-each select="tokenize(code, ',')">
            <xsl:variable name="i" select="position()"/>
            <map>
                <string key="code">
                    <xsl:value-of select="."/>
                </string>
                <string key="description">
                    <xsl:value-of select="$descr[$i]"/>
                </string>
            </map>  
        </xsl:for-each>
    </array>    
</xsl:template>

</xsl:stylesheet>

to get:

<?xml version="1.0" encoding="UTF-8"?>
<array key="somefield">
   <map>
      <string key="code">A</string>
      <string key="description">Description of A</string>
   </map>
   <map>
      <string key="code">B</string>
      <string key="description"> Description of B</string>
   </map>
   <map>
      <string key="code">C</string>
      <string key="description"> Description of C</string>
   </map>
</array>

(Sorry, I don't have the time to adjust this to output JSON.)