XML and DTD Example (open editor)
<?xml version =“1.0” encoding="US-ASCII"?>
<!ELEMENT PERSON (NAME, (EMAIL)+)>
<!ELEMENT NAME (FIRSTNAME, LASTNAME)>
<!ELEMENT FIRSTNAME (#PCDATA)>
<!ELEMENT LASTNAME (#PCDATA)>
<!ELEMENT EMAIL (#PCDATA)>
<FIRSTNAME>Ben</FIRSTNAME>
<LASTNAME>Zhao</LASTNAME>
<EMAIL>ravenben@cs.berkeley.edu</EMAIL>
<EMAIL>ravenben@joker.cs.berkeley.edu</EMAIL>