1<!ELEMENT letter-order (head?, body)>
2<!ATTLIST letter-order version CDATA #REQUIRED>
3
4	<!ELEMENT head (create | title | comment | generator)*>
5
6		<!ELEMENT create EMPTY>
7		<!ATTLIST create user CDATA #IMPLIED>
8		<!ATTLIST create host CDATA #IMPLIED>
9		<!ATTLIST create date CDATA #IMPLIED>
10		<!ATTLIST create source CDATA #IMPLIED>
11
12		<!ELEMENT title (#PCDATA)>
13
14		<!ELEMENT comment (#PCDATA)>
15
16		<!ELEMENT generator EMPTY>
17		<!ATTLIST generator name CDATA #REQUIRED>
18		<!ATTLIST generator version CDATA #REQUIRED>
19
20	<!ELEMENT body (area?, order+)>
21
22		<!ELEMENT area EMPTY>
23		<!ATTLIST area width CDATA "16">
24		<!ATTLIST area height CDATA #IMPLIED>
25
26		<!ELEMENT order (#PCDATA | sp | null)*>
27
28			<!ELEMENT sp EMPTY>
29
30			<!ELEMENT null EMPTY>
31