Operator Dictionary MathML 2 vs. MathML 3

Dear MathML experts,

since the operator dictionary in MathML 3 changed from the one in MathML
2, which one is preferred for visual renderers? There are many small
differences (e.g. the space around "-"), which will break compatibility
with previous versions. As there is no indication in the MathML file
which version is preferred, what is the recommended implementation?
Should an implementation provide a switch for MathML 2 vs. 3 rendering mode?

Rationale: JEuclid ( http://jeuclid.sourceforge.net/ ) is currently
being prepared for MathML 3 support.

Max

-- 
http://max.berger.name/
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