#!/usr/bin/python -u
import libxml2

doc = libxml2.parseFile("ex4.xml")

rngp = libxml2.relaxNGNewParserCtxt("ex4.rng")
rngs = rngp.relaxNGParse()
ctxt = rngs.relaxNGNewValidCtxt()
print "validates: ", (doc.relaxNGValidateDoc(ctxt) == 0)