Chapter 4\ElementChoices.xml

<?xml version="1.0"?>

<!DOCTYPE accounts [
	<!ELEMENT accounts ( account+ )>
	<!ELEMENT account  ( checking | savings )>
	<!ELEMENT checking (#PCDATA)>
	<!ELEMENT savings  (#PCDATA)>
]>

<accounts>

	<account>
		<checking>Money Market</checking>
	</account>

	<account>
		<savings>SaverPlus</savings>
	</account>

</accounts>