The <ABOVE> element is used to draw a line, arrow, curly bracket, or accent above the expression enclosed by this element. Stretchy symbols should be stretched to match the width of the enclosed expression. For example:
_____ <above>X + Y</above> giving X + Y ===== <above sym=equals>X + Y</above> giving X + Y
You can also place an expression centered above the line or arrow with the SUP element or its shortref form, for example:
<above sym=cub>n(n - 1)(n - 2)&dots;(n - m + 1)</above> <sup><text>total of m factors</text></sup>
which would be rendered as (within limits of ascii art):
total of m factors /---------------^-------------\ n(n - 1)(n - 2) ... (n - m + 1)
Note: Don't include the & prefix, so <above sym="→"> is wrong!