Indicates whether this entity type is commonly used as a reference target.
This is used by the Entity reference field to promote an entity type in the add new field select list in Field UI.
Type: bool
protected $common_reference_target = FALSE;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityType.php/property/EntityType::common_reference_target/8.1.x