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<!ELEMENT HEADER (DISTRIBUTION, SUBJECT, DATE)>
<!ELEMENT DISTRIBUTION (TO, CC?, FROM)>
<!ELEMENT TO (#PCDATA | IDENTITY)*>
<!ELEMENT CC (#PCDATA | IDENTITY)*>
<!ELEMENT FROM (#PCDATA| IDENTITY)*>
<!ELEMENT IDENTITY (#PCDATA)>
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<!ELEMENT SUBJECT (#PCDATA | DESCRIP)*>
<!ELEMENT DESCRIP (#PCDATA)>
<!ELEMENT DATE (YEAR, MONTH, DAY, (HOUR,MINUTE,SECOND)?)>
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<!ELEMENT DAY (#PCDATA)>
<!ELEMENT HOUR (#PCDATA)>
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<!ELEMENT AUTHOR (IDENTITY+)>
<!ELEMENT TYPIST (IDENTITY+)>
<!ELEMENT PARAGRAPH (#PCDATA|HIGHLIGHT|IDENTITY)*>
<!ELEMENT HIGHLIGHT (#PCDATA)>
<!ELEMENT HEADLINE (#PCDATA)>
<!ELEMENT MAIN ((PARAGRAPH | HIGHLIGHT | HEADLINE)*, AUTHOR?, TYPIST?)>