xslt 1.0 combinate two segments - xslt-1.0

Question

how to combinate two or more segments to one segment at xslt 1.0?
I have two cases.
Case1:
If "QUALIFIER" at GRP/TXT is the same (for example: AAA) combinate this to one.
Correct:
QUALIFIER: AAA
TEXT: Test AAA rtetertertret
Case2:
Same should be at GRP/ITEM/TXT (for example: LIN)
Correct:
QUALIFIER: LIN
TEXT: Test LIN sdfsdfsfsf
<?xml version="1.0"?>
<SEEDELFOR>
<Test/>
<CNT>
<TRANSMISSION_DATE></TRANSMISSION_DATE>
<TRANSMISSION_TIME></TRANSMISSION_TIME>
<INTERCHANGE_CONTROL_NUMBER></INTERCHANGE_CONTROL_NUMBER>
<SENDER></SENDER>
<SENDER_QUALIFIER></SENDER_QUALIFIER>
<RECEIVER></RECEIVER>
<RECEIVER_QUALIFIER></RECEIVER_QUALIFIER>
<SYNTAX_IDENTIFIER></SYNTAX_IDENTIFIER>
<SYNTAX_VERSION></SYNTAX_VERSION>
<BGM></BGM>
<GRP>
<IDENTIFIER_BY></IDENTIFIER_BY>
<IDENTIFIER_SU></IDENTIFIER_SU>
<DATE_4></DATE_4>
<REF_ON></REF_ON>
<ADD>
<QUALIFIER></QUALIFIER>
<IDENTIFIER></IDENTIFIER>
<AGENCY_CODE></AGENCY_CODE>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
</ADD>
<ADD>
<QUALIFIER></QUALIFIER>
<IDENTIFIER></IDENTIFIER>
<AGENCY_CODE></AGENCY_CODE>
</ADD>
<TXT>
<QUALIFIER>AAA</QUALIFIER>
<TEXT>Test AAA</TEXT>
</TXT>
<TXT>
<QUALIFIER>AAA</QUALIFIER>
<TEXT>rtetertertret</TEXT>
</TXT>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<ITEM>
<ITEM_NUMBER_SA></ITEM_NUMBER_SA>
<QUANTITY></QUANTITY>
<QUANTITY_UNIT></QUANTITY_UNIT>
<LINE_ITEM_NUMBER>2</LINE_ITEM_NUMBER>
<TXT>
<QUALIFIER>LIN</QUALIFIER>
<TEXT>Test LIN</TEXT>
</TXT>
</ITEM>
<ITEM>
<ITEM_NUMBER_SA></ITEM_NUMBER_SA>
<QUANTITY></QUANTITY>
<QUANTITY_UNIT></QUANTITY_UNIT>
<LINE_ITEM_NUMBER>1</LINE_ITEM_NUMBER>
<TXT>
<QUALIFIER>LIN</QUALIFIER>
<TEXT>Test LIN</TEXT>
</TXT>
<TXT>
<QUALIFIER>LIN</QUALIFIER>
<TEXT>sdfsdfsfsf</TEXT>
</TXT>
</ITEM>
</GRP>
</CNT>
</SEEDELFOR>
Correct output should be:
<?xml version="1.0"?>
<SEEDELFOR>
<Test/>
<CNT>
<TRANSMISSION_DATE></TRANSMISSION_DATE>
<TRANSMISSION_TIME></TRANSMISSION_TIME>
<INTERCHANGE_CONTROL_NUMBER></INTERCHANGE_CONTROL_NUMBER>
<SENDER></SENDER>
<SENDER_QUALIFIER></SENDER_QUALIFIER>
<RECEIVER></RECEIVER>
<RECEIVER_QUALIFIER></RECEIVER_QUALIFIER>
<SYNTAX_IDENTIFIER></SYNTAX_IDENTIFIER>
<SYNTAX_VERSION></SYNTAX_VERSION>
<BGM></BGM>
<GRP>
<IDENTIFIER_BY></IDENTIFIER_BY>
<IDENTIFIER_SU></IDENTIFIER_SU>
<DATE_4></DATE_4>
<REF_ON></REF_ON>
<ADD>
<QUALIFIER></QUALIFIER>
<IDENTIFIER></IDENTIFIER>
<AGENCY_CODE></AGENCY_CODE>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
<CONTACT>
<QUALIFIER></QUALIFIER>
<NUMBER></NUMBER>
</CONTACT>
</ADD>
<ADD>
<QUALIFIER></QUALIFIER>
<IDENTIFIER></IDENTIFIER>
<AGENCY_CODE></AGENCY_CODE>
</ADD>
<TXT>
<QUALIFIER>AAA</QUALIFIER>
<TEXT>Test AAA rtetertertret</TEXT>
</TXT>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<TRANSPORT_DETAILS>
<ADDITIONAL_DETAILS>
<QUALIFIER></QUALIFIER>
<DETAILS></DETAILS>
</ADDITIONAL_DETAILS>
</TRANSPORT_DETAILS>
<ITEM>
<ITEM_NUMBER_SA></ITEM_NUMBER_SA>
<QUANTITY></QUANTITY>
<QUANTITY_UNIT></QUANTITY_UNIT>
<LINE_ITEM_NUMBER>2</LINE_ITEM_NUMBER>
<TXT>
<QUALIFIER>LIN</QUALIFIER>
<TEXT>Test LIN</TEXT>
</TXT>
</ITEM>
<ITEM>
<ITEM_NUMBER_SA></ITEM_NUMBER_SA>
<QUANTITY></QUANTITY>
<QUANTITY_UNIT></QUANTITY_UNIT>
<LINE_ITEM_NUMBER>1</LINE_ITEM_NUMBER>
<TXT>
<QUALIFIER>LIN</QUALIFIER>
<TEXT>Test LIN sdfsdfsfsf</TEXT>
</TXT>
</ITEM>
</GRP>
</CNT>
</SEEDELFOR>
Best regards
Julian

Answer 1

It can be achievable as following in XSLT 1.0:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes" />
<xsl:strip-space elements="*" />
<xsl:key name="qualifierKey" match="/SEEDELFOR/CNT/GRP//TXT" use="QUALIFIER" />
<xsl:key name="qualifierTextKey" match="/SEEDELFOR/CNT/GRP//TXT" use="concat(QUALIFIER, '|', TEXT)" />
<xsl:key name="itemTxtKey" match="/SEEDELFOR/CNT/GRP/ITEM/TXT" use="concat(generate-id(parent::*), QUALIFIER, '|', TEXT)" />
<xsl:template match="node() | #*">
<xsl:copy>
<xsl:apply-templates select="node() | #*" />
</xsl:copy>
</xsl:template>
<xsl:template match="TXT[position() > 1]" />
<xsl:template match="/SEEDELFOR/CNT/GRP/ITEM/TXT[following-sibling::*[1]][generate-id(.) = generate-id(key('itemTxtKey', concat(generate-id(parent::*), QUALIFIER, '|', TEXT))[1])]
| /SEEDELFOR/CNT/GRP/TXT[following-sibling::*[1]][generate-id() = generate-id(key('qualifierKey',QUALIFIER)[1])]">
<TXT>
<QUALIFIER>
<xsl:value-of select="normalize-space(QUALIFIER)" />
</QUALIFIER>
<TEXT>
<xsl:variable name="count" select="count(key('qualifierKey',QUALIFIER)[generate-id() = generate-id(key('qualifierTextKey', concat(QUALIFIER, '|', TEXT))[1])])" />
<xsl:for-each select="key('qualifierKey',QUALIFIER)[generate-id() = generate-id(key('qualifierTextKey', concat(QUALIFIER, '|', TEXT))[1])]">
<xsl:value-of select="normalize-space(TEXT)" />
<xsl:if test="$count != position()"><xsl:value-of select="' '"></xsl:value-of></xsl:if>
</xsl:for-each>
</TEXT>
</TXT>
</xsl:template>
</xsl:stylesheet>
See output here: http://xsltfiddle.liberty-development.net/jyRYYib/2