diff --git a/schema/native/consts.go b/schema/native/consts.go
index a3f8f97..616b114 100644
--- a/schema/native/consts.go
+++ b/schema/native/consts.go
@@ -53,6 +53,8 @@ const (
 
 	PropertyKeyContainerOwnerID = "$Container:ownerID"
 
+	ProperyKeyTreeID = "$Tree:ID"
+
 	PropertyValueContainerRoleOwner     = "owner"
 	PropertyValueContainerRoleIR        = "ir"
 	PropertyValueContainerRoleContainer = "container"