<http://schema.org/mpn>
"MDRE9LPL.AE"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/sony-mdre9lpl-sluchatka-do-ucha-135-mm-budici-jednotka-neodymovy-magnet-kabel-12-m-blue+dp137012/>