<!ELEMENT letter-order (head, body)>
<!ATTLIST letter-order 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 (area?, order+)>
	
		<!ELEMENT area EMPTY>
		<!ATTLIST area width CDATA "16">
		<!ATTLIST area height CDATA #IMPLIED>

		<!ELEMENT order (#PCDATA | sp | null)*>

			<!ELEMENT sp EMPTY>

			<!ELEMENT null EMPTY>
