What is the equivalent of 'greater-than-equal-to' or 'less-than-equal-to' in XML?

As XML is Unicode-aware, it prefers the raw characters ≤ and ≥. Alternatively, ≤ and ≥ are the hexadecimal character references to ≤ and ≥.

Thanks to comment from choroba.

>= and <=

For using it in programming languages I chose using Unicode:

Java
"\u2264" for ≤
"\u2265" for ≥

Python
u"\u2264" for ≤
u"\u2265" for ≥