ensure base is injected into rdflib graph

Author: cmungall

linkml_runtime/dumpers/rdflib_dumper.py

@@ -52,6 +52,9 @@ def as_rdf_graph(self, element: YAMLRoot, schemaview: SchemaView, prefix_map: Di
         # to set the underlying "@base"
         if "_base" in schemaview.namespaces():
             schemaview.namespaces()._base = schemaview.namespaces()["_base"]
+            g.base = schemaview.namespaces()._base
+        if schemaview.namespaces()._base:
+            g.base = schemaview.namespaces()._base
         self.inject_triples(element, schemaview, g)
         return g