< Creating DTDs >

A simple DTD for storing contact:


<?xml version="1.0">
<!DOCTYPE contact-book [
   <!ENTITY username "Jonathan Eisenzopf">

   <!ELEMENT contact (record)*>
   <!ELEMENT record (name, address*, phone?, email?, favorite)>
   <!ELEMENT name (#PCDATA)>
   <!ELEMENT address (#PCDATA)>
   <!ELEMENT phone (#PCDATA)>
   <!ELEMENT email (#PCDATA)>
   <!ELEMENT favorite EMPTY>

   <!ATTLIST record id ID #REQUIRED 
             address type (primary | secondary) #REQUIRED
             favorite value (yes | no) #IMPLIED          
   ]>
]>