Hi, FYI I have implemented basic validator and it's gml implementation https://github.com/jachym/pywps-4/issues/11 Tests need to be done now (doctests would be too messy) Jachym -- Jachym Cepicky URL: http://les-ejk.cz e-mail: jachym.cepicky at gmail com PGP: http://les-ejk.cz/pgp/JachymCepicky.pgp @jachymc