[xsl] not grouping but nearly the same?!

hallo list
--
these are my first steps in xsl-programming, but it is quite difficult... 

my problem:
i've got a xml like that (only a little part of it):

<root>
<CITYENTRY CITYNO="1">
        <CITYNAME>Aach, Hegau</CITYNAME>
        <CITYZIP>78267</CITYZIP>
        <CITYPRICE>7,50</CITYPRICE>
        <TYPE>3</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>72866-00</MEMBERNO>
        </ALLMEMBERNO>
</CITYENTRY>
<CITYENTRY CITYNO="2">
        <CITYNAME>Aachen</CITYNAME>
        <CITYZIP>52062</CITYZIP>
        <CITYPRICE>5,50</CITYPRICE>
        <TYPE>3</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>34-00</MEMBERNO>
                <MEMBERNO>43096-00</MEMBERNO>
        </ALLMEMBERNO>
</CITYENTRY>
<CITYENTRY CITYNO="32074">
        <CITYNAME>Aach-Linz = Pfullendorf , Baden 88630</CITYNAME>
        <CITYZIP>88630</CITYZIP>
        <CITYPRICE>5,50</CITYPRICE>
        <TYPE>2</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>34-00</MEMBERNO>
                <MEMBERNO>43096-00</MEMBERNO>
        </ALLMEMBERNO>
        </CITYENTRY>
<CITYENTRY CITYNO="3">
        <CITYNAME>Aachen</CITYNAME>
        <CITYZIP>52062</CITYZIP>
        <CITYPRICE>5,50</CITYPRICE>
        <TYPE>3</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>34-00</MEMBERNO>
                <MEMBERNO>43096-00</MEMBERNO>
        </ALLMEMBERNO>
</CITYENTRY>
<CITYENTRY CITYNO="4">
        <CITYNAME>Aachen</CITYNAME>
        <CITYZIP>52064</CITYZIP>
        <CITYPRICE>5,50</CITYPRICE>
        <TYPE>3</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>34-00</MEMBERNO>
                <MEMBERNO>43096-00</MEMBERNO>
        </ALLMEMBERNO>
</CITYENTRY>
<CITYENTRY CITYNO="5">
        <CITYNAME>Aachen</CITYNAME>
        <CITYZIP>52066</CITYZIP>
        <CITYPRICE>5,50</CITYPRICE>
        <TYPE>3</TYPE>
        <ALLMEMBERNO>
                <MEMBERNO>34-00</MEMBERNO>
                <MEMBERNO>43096-00</MEMBERNO>
        </ALLMEMBERNO>
</CITYENTRY>

</root>


-> when ever a CITYENTRY of TYPE = 3 is direct followed by an other CITYENTRY 
TYPE =  3 with exact the same CITYNAME and ALLMEMBERNO then i want to delete 
the actual CITYENTRY and put in the followed CITYENTRY the CITYZIP of the 
actual CITYENTRY in the tag CITYZIPEND.

my code works, exept the fact, that i can't fill CITYZIPEND.
have anyone an idea?

here is my code:


<?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" version='1.0' encoding='utf-8' indent='no'/>


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

        <!-- ............................................. -->

        <xsl:template match="/root">
        <root>


                <xsl:for-each select="CITYENTRY">

                        <!-- prev ALLMEMBERNO -->
                        <xsl:variable name="prevALLMEMBERNO">
                                <xsl:value-of 
select="preceding-sibling::*[1]/ALLMEMBERNO"/>
                        </xsl:variable>

                        <!-- next ALLMEMBERNO -->
                        <xsl:variable name="nextALLMEMBERNO">
                                <xsl:value-of 
select="following-sibling::*[1]/ALLMEMBERNO"/>
                        </xsl:variable>

                        <!-- pref CITYNAME -->
                        <xsl:variable name="prevCITYNAME">
                                <xsl:value-of 
select="preceding-sibling::*[1]/CITYNAME"/>
                        </xsl:variable>

                        <!-- next CITYNAME -->
                        <xsl:variable name="nextCITYNAME">
                                <xsl:value-of 
select="following-sibling::*[1]/CITYNAME"/>
                        </xsl:variable>

                        <!-- pref TYPE -->
                        <xsl:variable name="prevTYPE">
                                <xsl:value-of 
select="preceding-sibling::*[1]/TYPE"/>
                        </xsl:variable>

                        <!-- next TYPE -->
                        <xsl:variable name="nextTYPE">
                                <xsl:value-of 
select="following-sibling::*[1]/TYPE"/>
                        </xsl:variable>

                <xsl:choose>
                        <!-- Normale Stadt -->

                        <xsl:when test="TYPE = 3">
                                <xsl:choose>


                                        <!-- 
..................................................... -->
                                        <xsl:when test="$nextALLMEMBERNO = 
ALLMEMBERNO and
                                                                        
$nextCITYNAME = CITYNAME and
                                                                        
$nextTYPE = TYPE"
                                        >

                                        </xsl:when>

                                        <!-- 
..................................................... -->

                                        <xsl:when test="$nextALLMEMBERNO = 
ALLMEMBERNO and
                                                                        
$prevALLMEMBERNO = ALLMEMBERNO and
                                                                        
$prevCITYNAME = CITYNAME and
                                                                        
$nextCITYNAME = CITYNAME and
                                                                        
$prevTYPE = TYPE and
                                                                        
$nextTYPE = TYPE"
                                        >

                                        </xsl:when>

                                        <!-- 
..................................................... -->
                                        <xsl:when test="$nextALLMEMBERNO != 
ALLMEMBERNO and
                                                                        
$prevALLMEMBERNO = ALLMEMBERNO and
                                                                        
$prevCITYNAME = CITYNAME and
                                                                        
$nextCITYNAME != CITYNAME and
                                                                        
$prevTYPE = TYPE and
                                                                        
$nextTYPE != TYPE"
                                        >

                                        <xsl:copy>
                                                        <xsl:apply-templates 
select="@*|node()"/>
                                                        <xsl:element name = 
"CITYZIPEND">99999</xsl:element>
                                                </xsl:copy>
                                        </xsl:when>

                                        <!-- 
..................................................... -->
                                        <xsl:otherwise>
                                        <xsl:copy>
                                                        <xsl:apply-templates 
select="@*|node()"/>
                                                </xsl:copy>
                                        </xsl:otherwise>
                                        <!-- 
..................................................... -->

                                </xsl:choose>
                        </xsl:when>


                        <xsl:when test="TYPE = 1">
                        <xsl:copy>
                                <xsl:apply-templates select="@*|node()"/>
                                <xsl:element name = 
"Status">ausgeben</xsl:element>
                                </xsl:copy>
                        </xsl:when>

                        <xsl:when test="TYPE = 2">
                        <xsl:copy>
                                <xsl:apply-templates select="@*|node()"/>
                                <xsl:element name = 
"Status">ausgeben</xsl:element>
                                </xsl:copy>
                        </xsl:when>

                        <xsl:otherwise>

                        </xsl:otherwise>
                </xsl:choose>

        </xsl:for-each>
</root>   
</xsl:template>




</xsl:stylesheet>

thanks for any clues.



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