<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.abt.com/product/95251/Apple-21.5-iMac-3.3GHz-Intel-Quad-Core-i7-Retina-4K-Desktop-Computer-Z0RS0004B.html>