Attribute Error even with -a "gml:"

[Ashim Giyanani]

I followed the examples and suggestions of handling namespaces to read in an xml file. However, I am unable to resolve the issue. Below is the code I am using to generate the Classes and subclasses

python generateDS.py -a  "gml:" -o gmx_codelists.py -s gmx_codelists_app.py gmxCodelists.xml

The error is as follows:

AttributeError: 'NoneType' object has no attribute 'annotate'

I am attaching the xml file here. I performed a similar conversion from an xsd Catalog file and that worked properly. Can someone suggest a solution as how to get the output out of this xml file?

Thanks in advance!