Schema.org metadata is one of the most important SEO optimisation issues. This is what the extensions of HTML documents that allow search engine robots to better understand the meaning of individual subpages of your website are being called. Handling the visitor's metadata in Drupal already since version 7. In this article, I will present different ways to implement them.Schema.org metadata is one of the most important SEO optimisation issues. This is what the extensions of HTML documents that allow search engine robots to better understand the meaning of individual subpages of your website are being called. Handling the visitor's metadata in Drupal already since version 7. In this article, I will present different ways to implement them.