[latinreq] Equation alignment across equations?

One requirement in educational publishing for print is for related
equations to align on their equal signs.

This is tricky because there is no built-in syntax in HTML5 or, as far as i
am aware, MathML, to indicate that two completely separate equations
separated by other elements must align on, say, the equal sign (or is there
and i am just insufficiently familiar with MathML standard?).

To accomplish this, we need a syntax to indicate which equations are
related to each other.

Does anyone see a need for this?


Ben