Calling to_xml on an Array of ROXML objects results in an empty collection

[findchris]

Hi there.

I have a ROXML object that looks like:
class Activity
include ROXML
xml_accessor :id
end

If I have an array of these objects and call .to_xml on the array, I receive an empty xml collection:
"\n<activities type="array">\n\n"

Any idea why or how to fix this?
Thanks