From ec93eeddb10b960a943db4a7f2ab664a8f88e049 Mon Sep 17 00:00:00 2001
From: Joern Hees <dev@joernhees.de>
Date: Tue, 21 Jul 2015 16:42:04 +0200
Subject: [PATCH] make Identifier.__hash__ stable wrt. multi processes, fixes
 #500

---
 rdflib/term.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/rdflib/term.py b/rdflib/term.py
index 91cc06ea0..561c3e607 100644
--- a/rdflib/term.py
+++ b/rdflib/term.py
@@ -183,7 +183,9 @@ def __ge__(self, other):
         return self == other
 
     def __hash__(self):
-        return hash(type(self)) ^ hash(unicode(self))
+        t = type(self)
+        fqn = t.__module__ + '.' + t.__name__
+        return hash(fqn) ^ hash(unicode(self))
 
 
 class URIRef(Identifier):
@@ -930,8 +932,12 @@ def __hash__(self):
         -- 6.5.1 Literal Equality (RDF: Concepts and Abstract Syntax)
 
         """
-
-        return unicode.__hash__(self) ^ hash(self.language.lower() if self.language else None) ^ hash(self.datatype)
+        res = super(Literal, self).__hash__()
+        if self.language:
+            res ^= hash(self.language.lower())
+        if self.datatype:
+            res ^= hash(self.datatype)
+        return res
 
     @py3compat.format_doctest_out
     def __eq__(self, other):