Re: Adding hierarchy

Thank you Dimitre. I see that I didn't give you enough info.
Your solution is close but I get 
    <lineGroup type="stanza"/>
when blankLine does not precede a lineGroup. 

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:key name="kLGroup" match="lineGroup"
  use="generate-id(preceding-sibling::blankLine[1])"/>

  <xsl:template match="@* | node()">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="blankLine">
   <lineGroup type="stanza">
     <xsl:copy-of select="key('kLGroup', generate-id())"/>
   </lineGroup>
  </xsl:template>

  <xsl:template match="lineGroup"/>

</xsl:stylesheet>

but source.xml can be more complicated with blankLine not preceding 
lineGroup:

<text>
  <blankLine/>
  <lineGroup>
    <line> </line>
    <line> </line>
  </lineGroup>
  <lineGroup>
    <line> </line>
    <line> </line>
    <lineGroup>
      <line> </line>
      <line> </line>
    </lineGroup>
    <line> </line>
  </lineGroup>
  <p/>
  <blankLine/>
  <p>This also happens. But does not produce a stanza.</p>
  <p/>
  <p/>
  <p/>
<lineGroup>
    <line>Make sure there is no stanza here</line>
    <line> </line>
    <lineGroup>
      <line> </line>
      <line> </line>
    </lineGroup>
    <line> </line>
  </lineGroup>
  <p/>
  <blankLine/>
  <lineGroup>
    <line> </line>
    <line> </line>
  </lineGroup>
  <lineGroup>
    <line> </line>
    <line> </line>
    <lineGroup>
      <line> </line>
      <line> </line>
    </lineGroup>
    <line> </line>
  </lineGroup>
  <p/>
</text>



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