Form validation and rendering

[bcogrel]

Externalize it into a separate project.

WTForms looks nice (especially http://wtforms.readthedocs.org/en/latest/specific_problems.html#dynamic-form-composition).

Should we use it directly or should we use its framework-specific packages? Convenient CSRF management may require to do so.

[bcogrel]

See Flask-wtf https://flask-wtf.readthedocs.org/en/latest/index.html

[bcogrel]

Alternatively, see RDF/POST http://www.lsrn.org/semweb/rdfpost.html .
Used in Graphity https://github.com/Graphity/graphity-browser/wiki/Features .