from lxml import etree
xsd_schema=open('atp_vo_feed_schema.xsd')
xml_file=open('lhcb_feed.xml')
xsd_parsed=etree.parse(xsd_schema)
xsd_parsed_schema=etree.XMLSchema(xsd_parsed)
xml_parsed=etree.parse(xml_file)
if xsd_parsed_schema.validate(xml_parsed):
    print "Sucess.\n It's valid XML feed."
else:
    print "Error:Invalid XML\n"
    print xsd_parsed_schema.error_log