<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (TITLE,AUTHOR+,SUMMARY*,NOTE?)>
<!ATTLIST DOCUMENT
     trackNum CDATA #REQUIRED
     secLevel (unclassified|classified) "unclassified">
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT AUTHOR (FIRSTNAME, LASTNAME, (UNIVERSITY | COMPANY)?)>
<!ELEMENT FIRSTNAME (#PCDATA)>
<!ELEMENT LASTNAME (#PCDATA)>
<!ELEMENT UNIVERSITY (#PCDATA)>
<!ELEMENT COMPANY (#PCDATA)>
<!ELEMENT SUMMARY (#PCDATA)>
<!ENTITY Description "This is a very simple sample document.">
]>
<DOCUMENT trackNum="1234">
<TITLE>Sample Document</TITLE>
<AUTHOR><FIRSTNAME>Simon</FIRSTNAME> <LASTNAME>St.Laurent</LASTNAME>
<COMPANY>XML Mania</COMPANY></AUTHOR>
<SUMMARY>This is element text and an entity follows:&Description; </SUMMARY></DOCUMENT>