<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://socialserp.biz/Manual-Instalador-de-Calefacci-n-y-Agua-Caliente-Sanitaria--Vol--1--Formaci-n-para-el-Empleo--Formacion-Empleo-Sectoria>