[xsl] The data at the root level is invalid+xslt

Hi,
     I have soap request in which i am stripping off some of the elements in 
the soap header elements and adding wssecurity elements and activityId.
   I am not touching the soap body. i was just copying it.
    

Here is my sample xml

<soapenv:Envelope xmlns:tri="http://abc.com/WebServices.Common"; 
xmlns:ns="http://abc.com/Case/471"; xmlns:con="http://xyz.com/eb/context"; 
xmlns:head="http://xyz.com/eb/header"; 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";>
        <soapenv:Header>
                <head:ESBHeader>
                        <head:ESBProps>
                                <head:Property>
                                        <head:name>?</head:name>
                                        <head:value>?</head:value>
                                </head:Property>
                        </head:ESBProps>
                        
                </head:ESBHeader>
                <con:Context>
                        <con:clientReqId>?</con:clientReqId>
                        <con:transId>?</con:transId>
                        <con:msgTyp>?</con:msgTyp>
                        <con:Security>
                                <con:UsernameToken>
                                        <con:username></con:username>
                                        <con:password>1</con:password>
                                        
                                </con:UsernameToken>
                        </con:Security>
                        
                </con:Context>
        </soapenv:Header>
        <soapenv:Body>
                <ns:SearchCases>
                        <ns:request>
                                <tri:SessionId>?</tri:SessionId>
                                <ns:Member>
                                        <ns:MemberId>?</ns:MemberId>
                                        <ns:SystemId>?</ns:SystemId>
                                </ns:ExternalMember>
                                <ns:Pagination>
                                        
<ns:CurrentPageNumber>?</ns:CurrentPageNumber>
                                                
                        </ns:request>
                </ns:SearchCases>
        </soapenv:Body>
</soapenv:Envelope>


Hers is my code 

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0" 
xmlns:xalan="http://xml.apache.org/xslt"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
exclude-result-prefixes="soapenv dp">   <xsl:output method="xml" 
omit-xml-declaration="no"/>
        <xsl:template match="/">
                <xsl:copy>
                        <xsl:apply-templates select="@*|node()"/>
                </xsl:copy>
        </xsl:template>
        <xsl:template match="soapenv:Header">
                <xsl:copy>
                        <xsl:copy-of select="@*"/>
                        <xsl:variable name="username">
                                <xsl:value-of 
select="/*[local-name()='Envelope']/*[local-name()='Header']/*[local-name()='Context']/*[local-name()='Security']/*[local-name()='UsernameToken']/*[local-name()='username']"/>
                        </xsl:variable>
                        <xsl:variable name="password">
                                <xsl:value-of 
select="/*[local-name()='Envelope']/*[local-name()='Header']/*[local-name()='Context']/*[local-name()='Security']/*[local-name()='UsernameToken']/*[local-name()='password']"/>
                        </xsl:variable>
                        <xsl:variable name="transactionId">
                                <xsl:value-of 
select="/*[local-name()='Envelope']/*[local-name()='Header']/*[local-name()='Context']/*[local-name()='transId']"/>
                        </xsl:variable>
                                                <ActivityId CorrelationId="" 
xmlns="http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics";>
                                <xsl:value-of select="$transactionId"/>
                        </ActivityId>
                        <wsse:Security 
xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd";>
                                <wsse:UsernameToken>
                                        <wsse:Username>
                                                <xsl:value-of 
select="$username"/>
                                        </wsse:Username>
                                        <wsse:Password>
                                                <xsl:value-of 
select="$password"/>
                                        </wsse:Password>
                                </wsse:UsernameToken>
                        </wsse:Security>
                </xsl:copy>
                        </xsl:template>
        <xsl:template 
match="/*[local-name()='Envelope']/*[local-name()='Header']/*[local-name()='ESBHeader']
 "/>
        <xsl:template 
match="/*[local-name()='Envelope']/*[local-name()='Header']/*[local-name()='Context']
 "/>
<xsl:template match="*">
                <xsl:element name="{name(.)}" namespace="{namespace-uri(.)}">
                        <xsl:copy-of select="@*"/>
                        <xsl:apply-templates/>
                </xsl:element>
        </xsl:template>
</xsl:stylesheet>

When try to hit the backend service i am gettign the following error msgs
  I am getting the following error msg

<s:Body><s:Fault><faultcode 
xmlns:a="http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher";>a:DeserializationFailed</faultcode><faultstring
 xml:lang="en-US">The formatter threw an exception while trying to deserialize 
the message: Error in deserializing body of request message for operation 
'SearchCases'. The data at the root level is invalid. Line 69, position 
4.</faultstring>

    So what exactly is the problem, am doing any mistake
The data at the root level is invalid. Line 69, position 4

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