XSL to insert blank <container> into EAD (to address the c03 c04 repitition issue)

gistfile1.txt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="xs"
  version="2.0">
  <!--copy everything-->
  
  <xsl:output omit-xml-declaration="yes"/>
  <xsl:template match="@* | node()">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()" mode="#current"/>
    </xsl:copy>
  </xsl:template>
  
  <xsl:template match="did[../../c04[@level='file']]">
    <xsl:copy>
      <xsl:apply-templates select="@*|comment()"/>
      <xsl:apply-templates select="container"/>  <!-- bring the containers to the top -->
      <xsl:element name="container"></xsl:element>
      <xsl:apply-templates select="* except container"/> <!-- process everything else -->
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>