In case you have non-HTML pages on your web site, which include PDFs or spreadsheets, you received’t have the ability to implement hreflang while in the in the HTML because it doesn’t exist.  En muchas ocasiones, en las tiendas online se generan URLs que expresan filtros y códigos de seguimiento, https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html