<?xml version="1.0"?>
<!-- The first step is to name and define our documents-->
<!DOCTYPE address_book [
	<!ELEMENT address_book (record+)>
	<!ELEMENT record (name | address | contact)>
	<!ELEMENT name (#PCDATA)>
	<!ELEMENT address (#PCDATA)>
	<!ELEMENT contact (#PCDATA)>
]>
<address_book>
	<record>
		<name/>
	</record>
	<record>
		<address/>
	</record>
	<record>
		<contact/>
	</record>
</address_book>

