default namespaces are nly supported by lxml

fastkml/kml.py

@@ -117,7 +117,10 @@ class KML(object):
             root = etree.Element('%skml' % self.ns)
             root.set('xmlns', config.NS[1:-1])
         else:
-            root = etree.Element('%skml' % self.ns, nsmap={None:self.ns[1:-1]})
+            if config.LXML:
+                root = etree.Element('%skml' % self.ns, nsmap={None:self.ns[1:-1]})
+            else:
+                root = etree.Element('%skml' % self.ns)
         for feature in self.features():
             root.append(feature.etree_element())
         return root

fastkml/test_main.py

@@ -119,7 +119,7 @@ class BuildKmlTestCase(unittest.TestCase):
         """ kml file without contents """
         k = kml.KML()
         self.assertEqual(len( list(k.features())),0)
-        if hasattr(etree, 'register_namespace'):
+        if config.LXML:
             self.assertEqual( str(k.to_string())[:43],
             '<kml xmlns="http://www.opengis.net/kml/2.2"/>'[:43])
         else: