<!--applies to xmlap21b.xml-->
<!ELEMENT MEMO (HEADER, MAIN)>
<!--- MEMO DTD Version 0.1 - Experimental Use Only -->
<!ELEMENT HEADER (DISTRIBUTION, SUBJECT, DATE)>
<!ELEMENT DISTRIBUTION (TO+, CC?, FROM+)>
<!ELEMENT TO (#PCDATA)>
<!ELEMENT CC (#PCDATA)>
<!ELEMENT FROM (#PCDATA)>
<!ELEMENT SUBJECT (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
<!ELEMENT AUTHOR (#PCDATA)>
<!ELEMENT TYPIST (#PCDATA)>
<!ELEMENT MAIN (#PCDATA | AUTHOR | TYPIST)*>