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# $Id$
import os
def relaxng(xml, rng):
"""
Validate a chunk of xml against a RelaxNG schema.
"""
# We could use either xmllint or jing here, but xmllint is easier.
# How to invoke jing, just in case:
#
# java -jar /usr/local/share/java/classes/jing.jar schema.rng foo.xml
#
# If error messages from xmllint are incomprehensible, try jing too.
i, o = os.popen4(("xmllint", "--noout", "--relaxng", rng, "-"))
i.write(xml)
i.close()
v = o.read()
o.close()
if v != "- validates\n":
raise RuntimeError, "RelaxNG validation failure:\n" + v
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