2 files changed, 10 insertions, 0 deletions
diff --git a/bsfs/schema/schema.py b/bsfs/schema/schema.py
index 8d9a821..0de4203 100644
--- a/bsfs/schema/schema.py
+++ b/bsfs/schema/schema.py
@@ -69,6 +69,7 @@ class Schema():
         literals.add(types.ROOT_LITERAL)
         predicates.add(types.ROOT_PREDICATE)
         # add minimally necessary types to the schema
+        literals.add(types.ROOT_BLOB)
         literals.add(types.ROOT_NUMBER)
         literals.add(types.ROOT_TIME)
         literals.add(types.ROOT_ARRAY)
@@ -312,4 +313,8 @@ class Schema():
         """Return the Literal matching the *uri*."""
         return self._literals[uri]
 
+    def predicates_at(self, node: types.Node) -> typing.Iterator[types.Predicate]:
+        """Return predicates that have domain *node* (or superclass thereof)."""
+        return iter(pred for pred in self._predicates.values() if node <= pred.domain)
+
 ## EOF ##
diff --git a/bsfs/schema/types.py b/bsfs/schema/types.py
index 3a2e10c..12e7e94 100644
--- a/bsfs/schema/types.py
+++ b/bsfs/schema/types.py
@@ -380,6 +380,11 @@ ROOT_LITERAL = Literal(
     parent=None,
     )
 
+ROOT_BLOB = Literal(
+    uri=ns.bsfs.BinaryBlob,
+    parent=ROOT_LITERAL,
+    )
+
 ROOT_NUMBER = Literal(
     uri=ns.bsfs.Number,
     parent=ROOT_LITERAL,