<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://community.skype.com/t5/Archive-Mac-OS-et-Linux/Probl%C3%A8me-avec-la-vid%C3%A9oconf%C3%A9rence/td-p/495873>