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# $Id$
import libxml2
def relaxng(xml, rng):
"""
Validate a chunk of XML against a RelaxNG schema.
"""
# Most of this is lifted from a libxml2 example. Using py-lxml
# might be a better approach, but this works for now.
#
# This is probably very inefficient, as we make no attempt to
# retain validation contexts between calls. It's still much
# faster than calling xmllint or jing as an external program.
#
# Beware of cleaning up the following code. libxml2 is not well
# documented but there are hints that much of the following voodoo
# is required manual memory management (see py-lxml, above)
fh = open(rng, "r")
schema = fh.read()
fh.close()
rngp = libxml2.relaxNGNewMemParserCtxt(schema, len(schema))
rngs = rngp.relaxNGParse()
ctxt = rngs.relaxNGNewValidCtxt()
doc = libxml2.parseDoc(xml)
ret = doc.relaxNGValidateDoc(ctxt)
if ret != 0:
raise RuntimeError, "RelaxNG validation error"
doc.freeDoc()
del rngp
del rngs
del ctxt
libxml2.relaxNGCleanupTypes()
# Memory debug specific
libxml2.cleanupParser()
if libxml2.debugMemory(1) != 0:
print "Memory leak %d bytes" % (libxml2.debugMemory(1))
libxml2.dumpMemory()
raise RuntimeError, "RelaxNG memory leak"
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