Not sure about extended character sets offhand, but the following standard ASCII characters need to be translated as so:
< becomes <
> becomes >
& becomes &amp;
For instance, if you have the following XML:
Code:
<blah>
<b1>Me & You</b1>
<b1>2 > 1</b1>
<b1>2 < 4</b1>
</blah>
It would need to be encoded as so:
Code:
<blah>
<b1>Me &amp; You</b1>
<b1>2 > 1</b1>
<b1>2 < 4</b1>
</blah>
Edit: Had to encode my &amp; twice above because the HTML was translating it!