https://api.drupal.org/api/drupal/core%21modules%21hal%21src%21LinkManager%21LinkManager.php/property/LinkManager%3A%3ArelationLinkManager/9
LinkManager::$relationLinkManager | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21modules%21hal%21src%21LinkManager%21RelationLinkManager.php/function/RelationLinkManager%3A%3AgetRelationUri/8.9.x
function RelationLinkManager::getRelationUri | Drupal API
functiondrupalapi
https://api.drupal.org/api/drupal/core%21modules%21rest%21src%21LinkManager%21RelationLinkManager.php/8.9.x
RelationLinkManager.php | Drupal API
phpdrupalapi