trying to help debug weird error with ckan spatial extension.

test.py

import ckanext.spatial.validation.validation as v
from lxml import etree

TEST_FILE = 'satellite-systems_dscovr.xml'

with open(TEST_FILE, 'r') as f:
    xmlobj = etree.XML(f.read())

validator = v.ISO19139NGDCSchema()
print(validator.is_valid(xmlobj))
# (True, [])

My pip dependencies:
apachemiddleware (0.1.1)
argparse (1.2.1)
Babel (0.9.6)
Beaker (1.6.4)
ckan (2.1a)
ckanext-harvest (0.2)
ckanext-spatial (0.2 )
decorator (3.4.0)
fanstatic (0.12)
FormAlchemy (1.4.2)
FormEncode (1.2.6)
Genshi (0.6)
GeoAlchemy (0.7.2)
Jinja2 (2.6)
lxml (3.2.4)
Mako (0.9.0)
MarkupSafe (0.15)
nose (1.3.0)
ofs (0.4.1)
OWSLib (0.8.2)
Pairtree (0.7.1-T)
Paste (1.7.5.1)
PasteDeploy (1.5.0)
PasteScript (1.7.5)
pika (0.9.8)
pip (1.4.1)
psycopg2 (2.4.5)
Pygments (1.6)
Pylons (0.9.7)
pyparsing (1.5.6)
python-dateutil (1.5)
python-openid (2.2.5)
pytz (2013.8)
pyutilib.component.core (4.5.3)
repoze.lru (0.6)
repoze.who (1.0.19)
repoze.who-friendlyform (1.0.8)
repoze.who.plugins.openid (0.5.3)
requests (1.1.0)
Routes (1.13)
setuptools (0.9.8)
Shapely (1.2.18)
simplejson (3.3.1)
solrpy (0.9.5)
SQLAlchemy (0.7.8)
sqlalchemy-migrate (0.7.2)
Tempita (0.5.1)
vdm (0.11)
WebError (0.10.3)
WebHelpers (1.3)
WebOb (1.0.8)
WebTest (1.4.3)
wsgiref (0.1.2)
zope.interface (4.0.1)