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-                      r793432f
+                      rffbe41d
         """
+        if tag is not None:
+            assert isinstance(tag, int), \
+                   "tag must be a character!"
+        if tag is not None and not isinstance(tag, int):
+            raise ValueError("tag must be a character")
         self.tag = tag
 …
         for a in attributes:
             assert isinstance(a, Attribute), \
                    "attribute must be of type Attribute!"
+            if not isinstance(a, Attribute):
+                raise ValueError("attribute must be of type Attribute")
         for a in attributes:

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Changeset ffbe41d for server/lib/gutenbach/ipp/core/attributegroup.py