BookTag.php in Metatag 8
File
metatag_open_graph/src/Plugin/metatag/Tag/BookTag.phpView source
<?php
namespace Drupal\metatag_open_graph\Plugin\metatag\Tag;
use Drupal\metatag\Plugin\metatag\Tag\MetaPropertyBase;
/**
* The Open Graph "Book tag" meta tag.
*
* @MetatagTag(
* id = "book_tag",
* label = @Translation("Book tag(s)"),
* description = @Translation("Appropriate keywords for this content."),
* name = "book:tag",
* group = "open_graph",
* weight = 38,
* type = "label",
* secure = FALSE,
* multiple = TRUE
* )
*/
class BookTag extends MetaPropertyBase {
}