Second try with CElegans.net.nml....

gistfile1.txt

unknown1040f3847b74:generatedNeuroML2 slarson$ ls -l CElegans.net.nml 
-rw-r--r--  1 slarson  staff  794999 Jan 13 16:43 CElegans.net.nml
unknown1040f3847b74:generatedNeuroML2 slarson$ pip show libNeuroML
---
Name: libNeuroML
Version: 0.1.9.1
Location: /usr/local/lib/python2.7/site-packages
Requires: 
unknown1040f3847b74:generatedNeuroML2 slarson$ python
Python 2.7.6 (default, Jan  2 2014, 15:58:06) 
[GCC 4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.28)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import neuroml
>>> from neuroml import loaders
>>> doc = loaders.NeuroMLLoader.load('./CElegans.net.nml')
Not a valid NeuroML 2 doc: (<type 'exceptions.AttributeError'>, AttributeError('nsmap',), <traceback object at 0x1042d9878>)