In certain, probably rare circumstances, you will wish to include parsed character data as a valid element. Mixing content works as expected. Thus, the following XML document would be valid.

    <?xml version = "1.0" encoding="UTF-8" standalone = "yes"?>
    <!DOCTYPE CONTACTS [
	<!ELEMENT CONTACTS ANY>
	<!ELEMENT CONTACT (NAME | EMAIL | PHONE | #PCDATA)*>
	<!ELEMENT NAME (#PCDATA)>
	<!ELEMENT EMAIL (#PCDATA)>
	<!ELEMENT PHONE (#PCDATA)>
	]>

    <CONTACTS>

    <CONTACT>
        <NAME>Roger Kaplan</NAME>
        <EMAIL>rabbit@kaplan.com</EMAIL>
        <PHONE>1800YOMOMMA</PHONE>
	Roger is a swingin' hep cat!
    </CONTACT>

    </CONTACTS>