schema type comparison across classes

1 files changed, 5 insertions, 5 deletions

diff --git a/bsfs/graph/resolve.py b/bsfs/graph/resolve.py
index 9b5f631..b671204 100644
--- a/bsfs/graph/resolve.py
+++ b/bsfs/graph/resolve.py
@@ -96,11 +96,11 @@ class Filter():
             # parse child expression
             subrng = self._parse_predicate_expression(pred)
             # determine the next type
-            try:
-                if rng is None or subrng > rng: # pick most generic range
-                    rng = subrng
-            except TypeError as err:
-                raise errors.ConsistencyError(f'ranges {subrng} and {rng} are not related') from err
+            if rng is None or subrng > rng: # pick most generic range
+                rng = subrng
+            # check range consistency
+            if not subrng <= rng and not subrng >= rng:
+                raise errors.ConsistencyError(f'ranges {subrng} and {rng} are not related')
         if not isinstance(rng, (bsc.Node, bsc.Literal)):
             raise errors.BackendError(f'the range of node {node} is undefined')
         return rng