I am generating some XML and then POSTing it to a jQuery based plugin. Looking at the POSTed XML in Firebug, everything appears normal. However, something is not getting passed to the plugin so it is using a amount (which results in no data being properly displayed). The solution turned out to be quite simple… set the Mime-Type on the posted XML! Doh!

So by adding

header('Content-Type: text/xml');

everything passed smoothly.