responding to ghiggin's comment
@@ -44,7 +44,8 @@ assert Namespace # avoid warning
logger = logging.getLogger(__name__)
# Type aliase to make unpacking what's going on a little more human friendly
-DatasetQuad = Tuple[Node, URIRef, Node, Optional[IdentifiedNode]]
+ContextNode = Union[IdentifiedNode, Literal, str, None]
+DatasetQuad = Tuple[Node, URIRef, Node, Optional[ContextNode]]
__doc__ = """\
