<https://www.prestashop.com/forums/topic/227012-how-to-add-custom-input-textfield-to-each-product-in-order/#comment-1116564>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.prestashop.com/forums/topic/227012-how-to-add-custom-input-textfield-to-each-product-in-order/#comment-1116709>