My hardline semantics reply would be... Jan Brasna wrote:
Math (a2), square units (km2),
Should be MathML?
chemistry formulas (Na2CO3) ...
ChemML?
... I see it more as an <exponent|index|agent|factor /> (metaphorically, if you know what I mean) than simply <sup|sub />
that's it, exactly. I'd rather see some specific elements with better defined semantics, but not in the core language, but as a module (if we're thinking XHTML 2.0 for a second).
but at least there's a tool for marking up that difference in a document. Theoretically, would you like it more if it were called <indexsomething />?
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