<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.abt.com/product/96252/Apple-27-iMac-4.0GHz-Intel-Quad-Core-i7-Retina-5K-Desktop-Computer-Z0SC0007F.html>