Need help with interpreting ${?xml!}

I could not find info on freemarker manual to interpret what this
Interpolation ${ variable?xml!}mean as used in the file shown below. Any
thought is welcomed...

[#ftl]
<?xml version="1.0" encoding="UTF-8"?>
<rows>
[#list confirmationLineItem as aConfLineItem]
 	<row id="${aConfLineItem_index}">
 	 	<cell>${aConfLineItem.pointNumber?xml!}</cell>
 	 	<cell>${aConfLineItem.thirdPartyRoleString?xml!}</cell>
 	 	<cell>${aConfLineItem.thirdPartyDuns?xml!}</cell>
 	 	<cell>${aConfLineItem.thirdPartyNonETSContractNumber?xml!}</cell>
 	 	<cell>${aConfLineItem.etsContractNumber?xml!}</cell>
		<cell>${aConfLineItem.nominatorName?xml!}</cell>
		<cell>${aConfLineItem.nomSignedVolumeString?xml!}</cell>
 	 	<cell>${aConfLineItem.confSignedVolumeString?xml!}</cell>
 	 	<cell>${aConfLineItem.schdSignedVolumeString?xml!}</cell>
 	 	<cell>${aConfLineItem.preFinalSignedVolumeString?xml!}</cell>
 	 	<cell>${aConfLineItem.reductionCode?xml!}</cell>
		 <cell>${aConfLineItem.etsPrelimSignedVolumeString?xml!}</cell>
		 <cell>${aConfLineItem.endDateString?xml!}</cell>
 	 	<cell>${aConfLineItem.nominatorDunsNumber?xml!}</cell>
 	 	<cell>${aConfLineItem.transactionType?xml!}</cell>
		<cell>${aConfLineItem.operatorChoice?xml!}</cell>
		 <cell>${aConfLineItem.source?xml!}</cell>
		<cell>${aConfLineItem.trackingNumber?xml!}</cell>
 	 	<cell>${aConfLineItem.nomDateTimeString?xml!}</cell>
 	 	 <cell>${aConfLineItem.confDateTimeString?xml!}</cell>
 	 	 <cell>${aConfLineItem.createUserId?xml!}</cell>
 	 	 <cell>${aConfLineItem.updateUserId?xml!}</cell>
 	 	
	</row>
[/#list]
</rows>
-- 
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