Re: not copying duplicate node to the output (remove

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

<xsl:template match="release[@display_on = 'headlines;'][doc_number =
../release[not(@display_on = 'headlines;')]/doc_number]" />

<xsl:template match="release[@display_on =
'headlines;'][normalize-space(doc_number) = '']">
  <xsl:copy-of select="." />
</xsl:template>

<xsl:template match="@display_on[not(. = 'headlines;')]">
  <xsl:attribute name="display_on">
    <xsl:value-of select="concat(., ';headlines')" />
  </xsl:attribute>
</xsl:template>

Hi I have this problem:
I need to combine two data groups below:
A. conditions:
1. Each release has a unique Id.
2. The two groups have duplicated <doc_number>s. if one <release> in data
group A has a <doc_number> that is already in data group B, remove that
entire <release> node in data group A.
3. Certain <release> does not even have a <doc_number>, but there is a
<doc_number /> tag to represent an empty value. in this case, we keep the
entire <release> node.
4. insert ";headlines;" into the "display_on" attribute to the <release>.
Current file:
<!-- start of file -->
<releases>
<!-- Data group A -->
<release id="2" name="AB" display_on="headlines;" type="NEWS">
 <doc_number>6</doc_number>
</release>
<release id="4" name="CD" display_on="headlines;" type="NOTICE">
 <doc_number>5</doc_number>
</release>
<release id="6" name="EF" display_on="headlines;" type="ORDER">
 <doc_number>4</doc_number>
</release>
<release id="8" name="GH" display_on="headlines;" type="ORDER">
 <doc_number>3</doc_number>
</release>
<release id="10" name="IJ" display_on="headlines;" type="NOTICE">
 <doc_number>2</doc_number>
</release>
<release id="12" name="KL" display_on="headlines;" type="NOTICE">
 <doc_number />
</release>

<!-- Data group B -->
<release id="14" name="XY" display_on="homepage" type="MEMORANDUM">
 <doc_number>5</doc_number>
</release>
<release id="16" name="MN" display_on="sidepage" type="NOTICE">
 <doc_number>4</doc_number>
</release>
<release id="18" name="OP" display_on="otherpage" type="NOTICE">
 <doc_number>3</doc_number>
</release>
</releases>
<!-- end of file -->
Desired resulting file:
<!-- start of file -->
<releases>
<!-- Data group A -->
<release id="2" name="AB" display_on="headlines;" type="NEWS">
 <doc_number>6</doc_number>
</release>
<release id="10" name="IJ" display_on="headlines;" type="NOTICE">
 <doc_number>2</doc_number>
</release>
<release id="12" name="KL" display_on="headlines;" type="NOTICE">
 <doc_number />
</release>

<!-- Data group B -->
<release id="14" name="XY" display_on="homepage;headlines"
type="MEMORANDUM">
 <doc_number>5</doc_number>
</release>
<release id="16" name="MN" display_on="sidepage;headlines" type="NOTICE">
 <doc_number>4</doc_number>
</release>
<release id="18" name="OP" display_on="otherpage;headlines" type="NOTICE">
 <doc_number>3</doc_number>
</release>
</releases>
<!-- end of file -->
Right now I have this code written to generate the result, but it only works
partially.
1. It removes the duplicated <doc_number> from each release, but it does not
remove the whole release.
2. It does not insert ";headlines;" into the "display_on" attribute to the
<release>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:template match="doc_number">
 <xsl:if test="not(string(.))">

 </xsl:if>
 <xsl:if test="not(. = following::fcc_doc_number)">
  <xsl:copy>
   <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
 </xsl:if>
</xsl:template>
<xsl:template match="@*|node()">
 <xsl:copy>
  <xsl:apply-templates select="@*|node()"/>
 </xsl:copy>
</xsl:template>
</xsl:stylesheet>
Please anyone help out? thank you!

--
Regards,
Mukul Gandhi