I am afraid the latest ruby-oci8 still doesn't support XMLType natively. However there is a workaround by KUBO, the author of ruby-oci8. You can find his workground at http://lists.rubyonrails.org/pipermail/rails/2006-March/023178.html
Hope this useful!
Hi LimLian !
Thanks for your reply.
I understand that the latest OCI(rubyoci8) don't support to handle XMLtype data
officially, but there is a workabound about that.
your reply is helpfult to me.