Set identifier of the parser sink to target graph. Fixes #432.

rdflib/plugins/parsers/trig.py

@@ -146,7 +146,7 @@ def parse(self, source, graph, encoding="utf-8"):
         # we're currently being handed a Graph, not a ConjunctiveGraph
         assert graph.store.context_aware, "TriG Parser needs a context-aware store!"
 
-        conj_graph = ConjunctiveGraph(store=graph.store)
+        conj_graph = ConjunctiveGraph(store=graph.store, identifier=graph.identifier)
         conj_graph.default_context = graph  # TODO: CG __init__ should have a
                                             # default_context arg
          # TODO: update N3Processor so that it can use conj_graph as the sink

test/test_issue432.py

@@ -0,0 +1,17 @@
+import rdflib
+
+def test_trig_default_graph():
+    ds = rdflib.ConjunctiveGraph()
+    data = """
+    @prefix : <http://example.com/> .
+
+    <> <b> <c> .
+    { <d> <e> <f> . }
+
+    <g1> { <d> <e> <f> . }
+    <g2> { <g> <h> <i> . }
+    """
+    ds.parse(data=data, format='trig', publicID=ds.default_context.identifier)
+
+    assert len(list(ds.contexts())) == 3
+    assert len(list(ds.default_context)) == 2