Not able to load xml in string to xmldocument object

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guys I have my xml in a string and I am trying to load xml into string it is showing me error. I am trying to load my xml document which is in string to xmldocument object but it is showing me following error:The '=' character, hexadecimal value 0x3D, cannot be included in a name. Line 10, position 27.My xml is in a string variable like this:\[code\]<?xml version="1.0" encoding="UTF-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><soapenv:Body><OTA_AirLowFareSearchRQ EchoToken="0" SequenceNmbr="0" TransactionIdentifier="0" AvailableFlightsOnly="" DirectFlightsOnly="" xmlns="http://www.opentravel.org/OTA/2003/05"><POS xmlns="http://www.opentravel.org/OTA/2003/05"><Source AgentSine="" PseudoCityCode="" TerminalID="1"><RequestorID ID="AFFILIATE"/></Source><YatraRequests><YatraRequestDoNotHitCache="false" DoNotCache="false" YatraRequestTypeCode="SMPA" Description="" MidOfficeAgentID="28737" AffiliateID="TRAVELPARTNER" /></YatraRequests></POS><TravelerInfoSummary><AirTravelerAvail><PassengerTypeQuantity Code="ADT" Quantity="1"/><PassengerTypeQuantity Code="CHD" Quantity="2"/><PassengerTypeQuantity Code="INF" Quantity="1"/></AirTravelerAvail></TravelerInfoSummary><SpecificFlightInfo><Airline Code=""/></SpecificFlightInfo><OriginDestinationInformation><DepartureDateTime>30/01/2013</DepartureDateTime><OriginLocation CodeContext="IATA" LocationCode=BLR>BLR</OriginLocation><DestinationLocation CodeContext="IATA" LocationCode=DEL>DEL</DestinationLocation></OriginDestinationInformation><TravelPreferences><VendorPref Code="SG"/><VendorPref Code="DN"/><CabinPref Cabin=Economy/></TravelPreferences></OTA_AirLowFareSearchRQ></soapenv:Body></soapenv:Envelope>\[/code\]