The cwm tool is used in Hets to convert between RDF formats. In order to install

it, you can do either:

(for Ubuntu)

sudo apt-get install swap-cwm

or

wget http://www.w3.org/2000/10/swap/cwm.tar.gz

tar -xvf cwm.tar.gz

cd cwm-1.2.1

sudo ./setup.py install