#!/usr/local/bin/python

import sys
try:
    import lxml.etree
except ImportError:
    sys.exit("%s requires the lxml library" % sys.argv[0])

if len(sys.argv) == 3:
    schema_fn = sys.argv[1]
    doc_fn = sys.argv[2]
else:
    sys.exit("Usage %s schema document" % sys.argv[0])


try:
    validator = lxml.etree.XMLSchema(lxml.etree.parse(schema_fn))
    doc = lxml.etree.parse(doc_fn)
    validator.assertValid(doc)
    print "%s is valid (based on %s)" % (doc_fn, schema_fn)
except EnvironmentError, e:
    sys.exit("%s" % e)
except lxml.etree.DocumentInvalid, e:
    sys.exit("Validation failed: %s" % e)