If it is conform the XML standard, I think you need to "escape" XML special chars like <,>,",',& using XML entities like < > " ' & (note HTML specific entities do not exist in XML)
http://en.wikipedia.org/wiki/List_of...ity_references
I haven't tried it , it's just theory. And if entities are supported, I'm not sure if non-ASCII chars can be used in the form &#nnnn; or &#xhhhh; (as it is EQ2 script that doesn't support non-ASCII, even when XML does using entities)