<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.codingforums.com/xml/299808-how-do-i-convert-all-characters-non-utf-8-utf-8-a.html?s=ffb3a2b3189d0b615978ca6946131c3e>