3 namespace Drupal\metatag_open_graph\Plugin\metatag\Tag;
5 use Drupal\metatag\Plugin\metatag\Tag\MetaPropertyBase;
8 * Provides a plugin for the 'book:release_date' meta tag.
11 * id = "book_release_date",
12 * label = @Translation("Release Date"),
13 * description = @Translation("The date the book was released."),
14 * name = "book:release_date",
15 * group = "open_graph",
22 class BookReleaseDate extends MetaPropertyBase {
23 // Nothing here yet. Just a placeholder class for a plugin.