<https://support.wpswings.com/wordpress-plugins-knowledge-base/what-is-the-basic-purpose-of-using-membership-for-woocommerce/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://support.wpswings.com/wordpress-plugins-knowledge-base/what-is-the-basic-purpose-of-using-membership-for-woocommerce/>