1 files changed, 6 insertions, 7 deletions
diff --git a/bsfs/graph/ac/null.py b/bsfs/graph/ac/null.py
index 6a923a5..c9ec7d0 100644
--- a/bsfs/graph/ac/null.py
+++ b/bsfs/graph/ac/null.py
@@ -1,9 +1,4 @@
-"""
 
-Part of the BlackStar filesystem (bsfs) module.
-A copy of the license is provided with the project.
-Author: Matthias Baumgartner, 2022
-"""
 # imports
 import typing
 
@@ -29,7 +24,7 @@ class NullAC(base.AccessControlBase):
 
     def is_protected_predicate(self, pred: schema.Predicate) -> bool:
         """Return True if a predicate cannot be modified manually."""
-        return pred.uri == ns.bsm.t_created
+        return pred.uri == ns.bsn.t_created
 
     def create(self, node_type: schema.Node, guids: typing.Iterable[URI]):
         """Perform post-creation operations on nodes, e.g. ownership information."""
@@ -50,7 +45,11 @@ class NullAC(base.AccessControlBase):
         """Return nodes that are allowed to be created."""
         return guids
 
-    def filter_read(self, node_type: schema.Node, query: ast.filter.FilterExpression) -> ast.filter.FilterExpression:
+    def filter_read(
+            self,
+            node_type: schema.Node,
+            query: typing.Optional[ast.filter.FilterExpression]
+            ) -> typing.Optional[ast.filter.FilterExpression]:
         """Re-write a filter *query* to get (i.e., read) *node_type* nodes."""
         return query