Writing something like this in an XML file works fine:
<cell>link^http://www.somesite.com/?param0=stuff</cell>";
However, this does not work:
<cell>link^http://www.somesite.com/?param0=stuff0¶m1=stuff1</cell>";
With the second line, the page displays a LoadXML error. The grid is expecting a link because setColTypes has link in the respective column. Everything else on the page works fine, so this seems like a parsing error.