--- /dev/null
+<?php
+
+namespace Drupal\comment\Plugin\Field\FieldType;
+
+/**
+ * Interface definition for Comment items.
+ */
+interface CommentItemInterface {
+
+ /**
+ * Comments for this entity are hidden.
+ */
+ const HIDDEN = 0;
+
+ /**
+ * Comments for this entity are closed.
+ */
+ const CLOSED = 1;
+
+ /**
+ * Comments for this entity are open.
+ */
+ const OPEN = 2;
+
+ /**
+ * Comment form should be displayed on a separate page.
+ */
+ const FORM_SEPARATE_PAGE = 0;
+
+ /**
+ * Comment form should be shown below post or list of comments.
+ */
+ const FORM_BELOW = 1;
+
+}