Allow specifying prefixes for namespaces in the XML that a SAML class instance is serialized to.

src/saml2/__init__.py

@@ -444,13 +444,12 @@ class SamlBase(ExtensionContainer):
     c_children = {}
     c_attributes = {}
     c_attribute_type = {}
-    #c_attribute_use = {}
-    #c_attribute_required = {}
     c_child_order = []
     c_cardinality = {}
     c_any = None
     c_any_attribute = None
     c_value_type = None
+    c_ns_prefix = None
     
     def _get_all_c_children_with_order(self):
         if len(self.c_child_order) > 0:
@@ -549,6 +548,9 @@ class SamlBase(ExtensionContainer):
             constructing the text representation.
         :return: String representation of the object
         """
+        if not nspair and self.c_ns_prefix:
+            nspair = self.c_ns_prefix
+
         if nspair:
             for prefix, uri in nspair.items():
                 try: