CKAN is a metadata platform that enables organisations to publish datasets.
This extension is a hook for each time when a dataset is added, when that dataset is proxyable through The DataTank, CKAN will automatically change the URL with a The DataTank adapter and deliver the data in XML, JSON and CSV.
You need 3 extra values in your CKAN ini file (typically stored in /etc/ckan/default/development.ini)
tdt.user = username
tdt.pass = password
tdt.host = http://yourhostname/subdir/ # mind the trailing slash!