Fix for reassigned term aliases (#2925)

rdflib/plugins/shared/jsonld/context.py

@@ -580,6 +580,11 @@ def _read_term(
 
         if idref in NODE_KEYS:
             self._alias.setdefault(idref, []).append(name)
+        else:
+            # undo aliases that may have been inherited from parent context
+            for v in self._alias.values():
+                if name in v:
+                    v.remove(name)
 
     def _rec_expand(
         self, source: Dict[str, Any], expr: Optional[str], prev: Optional[str] = None

test/jsonld/test_reassign_id.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from rdflib import BNode, Graph, Literal, Namespace, URIRef
+
+DATA = """
+{
+  "@context": {
+    "@version": 1.1,
+    "ex": "https://example.com/",
+    "@base": "https://example.com/res/",
+    "id": "@id",
+    "test": {
+      "@id": "ex:test",
+      "@context": {
+        "id": "ex:id"
+      }
+    }
+  },
+  "id": "parent",
+  "test": [
+    { "id": "item1" },
+    { "id": "item2" }
+  ]
+}
+"""
+
+DATA_OK = """
+<https://example.com/res/parent> <https://example.com/test> _:b0 .
+<https://example.com/res/parent> <https://example.com/test> _:b1 .
+_:b0 <https://example.com/id> "item1" .
+_:b1 <https://example.com/id> "item2" .
+"""
+
+EX = Namespace("https://example.com/")
+
+
+def test_reassign_id():
+    g = Graph().parse(data=DATA, format="json-ld")
+    # g = Graph().parse(data=DATA_OK)
+
+    parent = URIRef("https://example.com/res/parent")
+    ex_id = EX.id
+    ex_test = EX.test
+
+    objects = list(g.objects(parent, ex_test))
+
+    assert len(g) == 4
+    assert len(objects) == 2
+    for obj in objects:
+        assert isinstance(obj, BNode)
+        obj_pred_objects = list(g.predicate_objects(obj))
+        assert len(obj_pred_objects) == 1
+        assert obj_pred_objects[0][0] == ex_id
+        assert isinstance(obj_pred_objects[0][1], Literal)