Looks to me as though BOX has been omitted, and its tags are not omissible;
otherwise OVER is not allowed directly in %math (by oversight?).
Then again, LEFT isn't allowed directly in %math either:
<!ENTITY % math "BOX|ABOVE|BELOW|ROOT|ARRAY|SUB|SUP">
<!ENTITY % formula "#PCDATA|%math">
<!ELEMENT MATH - - (#PCDATA)* -(%notmath) +(%math)>
<!ATTLIST MATH
id ID #IMPLIED
model CDATA #IMPLIED>
This from Draft: Thu 1-Dec-94 15:47:30
Are we looking at different DTDs?
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