<!-- This is a sample email XML document and its associated DTD -->
<!-- The DTD is located at the start of the document -->
   <!ELEMENT email ( message+ ) >
   <!ELEMENT message ( to, from, cc, body+ ) >
   <!ELEMENT to ( #PCDATA ) >
   <!ELEMENT from ( #PCDATA ) >
   <!ELEMENT cc ( #PCDATA ) >
   <!ELEMENT body ( #PCDATA ) >
   <!ATTLIST message priority NMTOKEN #IMPLIED >