#hasComplexContenthasComplexContent() Returns true if the XMLList contains exactly one XML object which has complex content or if the XMLList contains several XML objects.
#hasSimpleContenthasSimpleContent() Returns true if the XMLList is empty or contains exactly one XML object which has simple content or contains no elements at all.
#propertyIsEnumerablepropertyIsEnumerable(propertyName) Returns true if the property name converted to a number is greater than or equal to 0 and less than the length of this XMLList.
Returns the concatenation of toXMLString called on each XML object. The result for each XML object is put on a separate line if XML.prettyPrinting is true.