As promised, the XQuery Sandbox is now humbly available for testing fully-functional XQuery scripts.
Please use cautiosly, since it is hosted on a relatively small web server.
A lot of work remains to be done to make the sandbox more user friendly.
At the moment compilation errors will result in blank page when the script is run.
As work progresses, this blog will be updated.
Click here or
the XQuery Hosting link on the left menu to enter the sandbox.