The CML plugin mainly works in background, providing reading and writing of Chemical Markup Language (CML) files. For further informaiton about CML, see the CML home page.
If you right click on a CML file in the BioResource Navigator, you can start a CMLValidateAction. This will tell you if the file complies with cml rules.
The CML library is licensed with the Artistic License.
Copyright for the Jumbo CML library is with Peter Murray-Rust.