CDATA refers to plain old character data that may be any string of characters that does not include ampersands (&), less than signs, (<), or quotation marks ("). Of course, as we discussed earlier, you may use the escaped characters such as &, <, or " if you must include those forbidden characters

<?xml version = "1.0"
         encoding="UTF-8"
         standalone = "yes"?>
<!DOCTYPE SCRIPT [
	<!ELEMENT SCRIPT ANY>
	<!ELEMENT DIALOG (#PCDATA)>
	<!ATTLIST DIALOG ACTOR CDATA>
	]>
<SCRIPT>
<DIALOG ACTOR = "Hanks">I don't think so!</DIALOG>
<DIALOG ACTOR = "Ryan">Why not?</DIALOG>
</SCRIPT>