I found this Use of Greater Than Symbol in XML where the answer is to use the following for 'greater-than' and 'less-than' respectively:
> and <
However, what should we use for 'greater-than-equal-to' and 'less-than-equal-to' ?
I already tried the following but it didn't work for me.
≥ and ≤ and >e; and <e;