How to Read all inner recursive values from XML using XSLT

Question

need to Extract Values from all levels of Recursive XML structure.The structurte in all levels is same

<regPackagingHierarchyList>
  <RegistrationPackagingHierarchy>
    <recordId>Level0</recordId>
    <regParentPackagingHierarchy>
      <RegistrationPackagingHierarchy>
        <recordId>level5</recordId>
        <regParentPackagingHierarchy>
          <RegistrationPackagingHierarchy>
            <recordId>level4</recordId>
            <regParentPackagingHierarchy>
              <RegistrationPackagingHierarchy>
                <recordId>level3</recordId>
                <regParentPackagingHierarchy>
                  <RegistrationPackagingHierarchy>
                    <recordId>level2</recordId>
                    <regParentPackagingHierarchy>
                      <RegistrationPackagingHierarchy>
                        <recordId>level1</recordId>
                      </RegistrationPackagingHierarchy>
                    </regParentPackagingHierarchy>
                  </RegistrationPackagingHierarchy>
                </regParentPackagingHierarchy>
              </RegistrationPackagingHierarchy>
            </regParentPackagingHierarchy>
          </RegistrationPackagingHierarchy>
        </regParentPackagingHierarchy>
      </RegistrationPackagingHierarchy>
    </regParentPackagingHierarchy>
  </RegistrationPackagingHierarchy>
</regPackagingHierarchyList>

Expected Result should be in the follwing format Level1,Level2,Level3,level4,Level5

Answer 1

One way in 1.0 can be:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="xml" />

<xsl:template match="/">
    <xsl:for-each select="//regParentPackagingHierarchy//recordId">
        <xsl:sort select="position()" order="descending" />
        <xsl:value-of select="." />
        <xsl:if test="position() != last()">
            <xsl:text>,</xsl:text>
        </xsl:if>
    </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

http://xsltfiddle.liberty-development.net/pPzifpv

Edit:

<xsl:value-of select="concat('Count(regPackagingHierarchyList) = ', count(//regPackagingHierarchyList))"/>
<xsl:value-of select="concat('Count(RegistrationPackagingHierarchy) = ', count(//RegistrationPackagingHierarchy))"/>

Edit 2:

http://xsltfiddle.liberty-development.net/pPzifpv/8