Here's my hack for id/idref namespaces... read-only, diff only includes Indicator.

diff --git a/stix/bindings/stix_common.py b/stix/bindings/stix_common.py
index f550507..069ed79 100644
--- a/stix/bindings/stix_common.py
+++ b/stix/bindings/stix_common.py
@@ -342,6 +342,31 @@ def find_attr_value_(attr_name, node):
             value = attrs.get('{%s}%s' % (namespace, name, ))
     return value

+def find_attr_value_qname(attr_name, node):
+    attrs = node.attrib
+    attr_parts = attr_name.split(':')
+    value = None
+    if len(attr_parts) == 1:
+        value = attrs.get(attr_name)
+    elif len(attr_parts) == 2:
+        prefix, name = attr_parts
+        namespace = node.nsmap.get(prefix)
+        if namespace is not None:
+            value = attrs.get('{%s}%s' % (namespace, name, ))
+    if value is None:
+        return None, None
+    val_parts = value.split(':')
+    if len(val_parts) == 1:
+        return value, None
+    elif len(val_parts) == 2:
+        prefix, data = val_parts
+        namespace = node.nsmap.get(prefix)
+        if namespace is not None:
+            return value, namespace
+        else:
+            raise ValueError("No namespace defined for qname prefix %s" % (prefix))
+    else:
+        raise ValueError("Malformed qname %s" % (value))

 class GDSParseError(Exception):
     pass
@@ -2617,9 +2642,11 @@ class IndicatorBaseType(GeneratedsSuper):
     specified elsewhere."""
     subclass = None
     superclass = None
-    def __init__(self, idref=None, id=None, timestamp=None):
+    def __init__(self, idref=None, id=None, timestamp=None, idrefns=None, idns=None):
         self.idref = _cast(None, idref)
+        self.idrefns = _cast(None, idrefns)
         self.id = _cast(None, id)
+        self.idns = _cast(None, idns)
         self.timestamp = _cast(None, timestamp)
     def factory(*args_, **kwargs_):
         if IndicatorBaseType.subclass:
@@ -2627,9 +2654,9 @@ class IndicatorBaseType(GeneratedsSuper):
         else:
             return IndicatorBaseType(*args_, **kwargs_)
     factory = staticmethod(factory)
-    def get_idref(self): return self.idref
+    def get_idref(self): return self.idref, self.idrefns
     def set_idref(self, idref): self.idref = idref
-    def get_id(self): return self.id
+    def get_id(self): return self.id, self.idns
     def set_id(self, id): self.id = id
     def get_timestamp(self): return self.timestamp
     def set_timestamp(self, timestamp): self.timestamp = timestamp
@@ -2674,14 +2701,16 @@ class IndicatorBaseType(GeneratedsSuper):
             nodeName_ = Tag_pattern_.match(child.tag).groups()[-1]
             self.buildChildren(child, node, nodeName_)
     def buildAttributes(self, node, attrs, already_processed):
-        value = find_attr_value_('idref', node)
+        value, ns = find_attr_value_qname('idref', node)
         if value is not None and 'idref' not in already_processed:
             already_processed.add('idref')
             self.idref = value
-        value = find_attr_value_('id', node)
+            self.idrefns = ns
+        value, ns = find_attr_value_qname('id', node)
         if value is not None and 'id' not in already_processed:
             already_processed.add('id')
             self.id = value
+            self.idns = ns
         value = find_attr_value_('timestamp', node)
         if value is not None and 'timestamp' not in already_processed:
             already_processed.add('timestamp')
diff --git a/stix/indicator/indicator.py b/stix/indicator/indicator.py
index f3ab87f..517a50f 100644
--- a/stix/indicator/indicator.py
+++ b/stix/indicator/indicator.py
@@ -513,8 +513,8 @@ class Indicator(stix.Entity):
         if not return_obj:
             return_obj = cls()

-        return_obj.id_              = obj.get_id()
-        return_obj.idref            = obj.get_idref()
+        return_obj.id_,return_obj.id_ns = obj.get_id()
+        return_obj.idref,return_obj.idref_ns = obj.get_idref()
         return_obj.timestamp        = obj.get_timestamp()

         if isinstance(obj, cls._binding_class):

Provide method for getting namespace from any ID #176

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