%Annotation-xml.content;
MathML Annotation Model
This Tag Set modifies the original MathML 2.0 DTD definition of this entity from ANY to one or more <p> elements. The original definition is extremely broad and can be problematic in conversions.
Remarks
Since this parameter entity was named in the same
way as the MathML Tag Set equivalent, it does not follow
the naming conventions for this Tag Set: it is in mixed (not lower) case.