diff --git a/python/obitools3/uri/decode.pyx b/python/obitools3/uri/decode.pyx
index 4a3d9cf..284b995 100644
--- a/python/obitools3/uri/decode.pyx
+++ b/python/obitools3/uri/decode.pyx
@@ -67,10 +67,10 @@ def open_dms_element(DMS dms, bytes path,
     if path_parts[0]==b"taxonomy":
         if len(path_parts) > 1:
             taxo = Taxonomy.open(dms,path_parts[1])
-            if len(path_parts) == 2:
+            if len(path_parts) == 3:
                 taxon=taxo[int(path_parts[2])]
                 return (dms,taxon)
-            elif len(path_parts) > 2:
+            elif len(path_parts) > 3:
                 raise MalformedURIException('Malformed Taxonomy URI')
             return (dms,taxo)
 
@@ -166,15 +166,15 @@ def open_uri(uri,
     if scheme==b"" or scheme==b"dms" :
         dms = open_dms(urip.path,create)
         if dms is None and default_dms is not None:
-            dms=(default_dms,urip.path)
-           
-        
+            dms=(default_dms, urip.path)
+
         if dms is not None:
             try:
                 resource=open_dms_element(dms[0],dms[1],
                                           create,
                                           newviewtype
                                           )
+                                
                 scheme=b"dms"
                 urip = ParseResultBytes(scheme=b"dms", 
                                         netloc=urip.netloc, 
@@ -185,7 +185,7 @@ def open_uri(uri,
                 
                 if default_dms is None:
                     config["obi"]["defaultdms"]=resource[0]
-                 
+                                
                 return (resource[0],
                         resource[1],
                         type(resource[1]),