How to match nodes with common attributes and different ones with xslt - xslt

Question

I Have an XML file like the one below. What I need to do is to add a Flag to each <TOKEN> node with a <MULTIPLE TYPE='YES'> node when:
there exist more than one <TOKEN> with the same #BEGIN-#END
at least one of the <TOKEN> #TEXT is different from the others with the same#BEGIN-#END
The xml code is the following:
<?xml version="1.0" encoding="UTF-8"?>
<ALL>
<RECORD TEMPLATE="PRODUCTS" DB="0">
<FIELD NAME="PRODUCT" BASE="AST" >
<TOKEN TEXT="AST" BEGIN="0" END="100"/>
</FIELD>
</RECORD>
<RECORD TEMPLATE="PRODUCTS" DB="1" >
<FIELD NAME="PRODUCT" BASE="BUC" >
<TOKEN TEXT="BUC" BEGIN="0" END="100"/>
<TOKEN TEXT="BUC" BEGIN="0" END="100"/>
<TOKEN TEXT="BUC" BEGIN="0" END="100"/>
<TOKEN TEXT="BUC" BEGIN="0" END="100"/>
<TOKEN TEXT="BUC" BEGIN="102" END="133"/>
<TOKEN TEXT="BUC" BEGIN="102" END="133"/>
</FIELD>
</RECORD>
<RECORD TEMPLATE="PRODUCTS" DB="1" >
<FIELD NAME="PRODUCT" BASE="BUC" >
<TOKEN TEXT="ART" BEGIN="300" END="450"/>
<TOKEN TEXT="ART" BEGIN="300" END="450"/>
</FIELD>
</RECORD>
</ALL>
The desired output is the following:
<ALL>
<RECORD DB="0" TEMPLATE="PRODUCTS">
<FIELD BASE="AST" NAME="PRODUCT">
<MULTIPLE TYPE="YES"/>
<TOKEN BEGIN="0" END="100" TEXT="AST"/>
</FIELD>
</RECORD>
<RECORD DB="1" TEMPLATE="PRODUCTS">
<FIELD BASE="BUC" NAME="PRODUCT">
<MULTIPLE TYPE="YES"/>
<TOKEN BEGIN="0" END="100" TEXT="BUC"/>
<MULTIPLE TYPE="YES"/>
<TOKEN BEGIN="0" END="100" TEXT="BUC"/>
<MULTIPLE TYPE="YES"/>
<TOKEN BEGIN="0" END="100" TEXT="BUC"/>
<MULTIPLE TYPE="YES"/>
<TOKEN BEGIN="0" END="100" TEXT="BUC"/>
<TOKEN BEGIN="102" END="133" TEXT="BUC"/>
<TOKEN BEGIN="102" END="133" TEXT="BUC"/>
</FIELD>
</RECORD>
<RECORD DB="1" TEMPLATE="PRODUCTS">
<FIELD BASE="BUC" NAME="PRODUCT">
<TOKEN BEGIN="300" END="450" TEXT="ART"/>
<TOKEN BEGIN="300" END="450" TEXT="ART"/>
</FIELD>
</RECORD>
</ALL>
I tried using the following xslt, and try to match either the #BEGIN-#END and the #TEXT, but it didn't work.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output encoding="UTF-8" cdata-section-elements="DOCUMENT" method="xml" indent="yes" omit-xml-declaration="no" />
<xsl:key name="token" match="//RECORD[#TEMPLATE='PRODUCTS']/FIELD[#NAME='PRODUCT']/TOKEN" use="concat(#BEGIN, '|', #END)"/>
<xsl:key name="text" match="//RECORD[#TEMPLATE='PRODUCTS']/FIELD[#NAME='PRODUCT']/TOKEN" use="#TEXT"/>
<xsl:template match="#*|node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="//RECORD[#TEMPLATE='PRODUCTS']/FIELD[#NAME='PRODUCT']/TOKEN [key('token', concat(#BEGIN, '|', #END))[2]] [(key('word', #TEXT)[2])] ">
<xsl:element name="MULTIPLE">
<xsl:attribute name="TYPE">YES</xsl:attribute>
</xsl:element>
<xsl:call-template name="identity" />
</xsl:template>
</xsl:stylesheet>
Removing form the xslt above the [(key('word', #TEXT)[2])] part of code, the <MULTIPLE TYPE='YES'> node is added, but on every <TOKEN> with the same #BEGIN-#END, not checking if exists a #TEXT node different from the others.

Answer 1

Can you check this:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output encoding="UTF-8" method="xml" indent="yes" omit-xml-declaration="no" />
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="TOKEN">
<xsl:variable name="current" select="concat(#BEGIN,#END)"/>
<xsl:variable name="text" select="#TEXT"/>
<xsl:for-each select="ancestor::RECORD/following-sibling::RECORD/FIELD/TOKEN|ancestor::RECORD/preceding-sibling::RECORD/FIELD/TOKEN">
<xsl:if test="(concat(#BEGIN,#END) = $current) and (#TEXT!=$text)">
<MULTIPLE TYPE="YES"/>
</xsl:if>
</xsl:for-each>
<TOKEN>
<xsl:apply-templates select="#*"/>
<xsl:apply-templates/>
</TOKEN>
</xsl:template>
</xsl:stylesheet>