internal static string GetKeyNameOfProperty(XElement element, string propertyName, ReflectionOnSeparateAppDomainHandler reflectionOnSeparateAppDomain)
        {
            string elementLocalName, elementNameSpace, assemblyNameIfAny;

            GetClrNamespaceAndLocalName(element.Name, out elementNameSpace, out elementLocalName, out assemblyNameIfAny);
            return(reflectionOnSeparateAppDomain.GetKeyNameOfProperty(elementNameSpace, elementLocalName, assemblyNameIfAny, propertyName));
        }