loadXML MethodloadXML Method takes valid XML string as parameter:

var xmlString = "<root><FirstName>Gregory</FirstName><LastName>Movsesyan</LastName><Email>webmaster@softxml.com</Email></root>";
softXMLLib.loadXML(xmlString);

loadXMLError property indicates if xml string is valid=0

if(softXMLLib.loadXMLError!=0){
	alert("Invalid XML string!");
}
else{
	Make here manipulation with XML			
				
}