<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mightyrabbitstudios.com/?Anecdotes-of-Painters--Engravers--Sculptors-and-Architects--and-Curiosities-of-Art--Vol--3-of-3--Classic-Reprint-.pdf>