<!ELEMENT letter-list (head, body)>
<!ATTLIST letter-list version CDATA #REQUIRED>

	<!ELEMENT head (create | title | comment | generator)*>

		<!ELEMENT create EMPTY>
		<!ATTLIST create user CDATA #IMPLIED>
		<!ATTLIST create host CDATA #IMPLIED>
		<!ATTLIST create date CDATA #IMPLIED>
		<!ATTLIST create source CDATA #IMPLIED>

		<!ELEMENT title (#PCDATA)>

		<!ELEMENT comment (#PCDATA)>

		<!ELEMENT generator EMPTY>
		<!ATTLIST generator name CDATA #REQUIRED>
		<!ATTLIST generator version CDATA #REQUIRED>

	<!ELEMENT body (letter+)>
	
		<!ELEMENT letter (#PCDATA)>
