<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.msxlabs.org/forum/soru-cevap/296222-matematik-icerikli-bir-okul-gazetesi-ve-sudoku-calismasi-nasil-yapilir.html>