parse an XML file and build a tree. It's like
       xmlParseFile() except it bypass all catalog lookups.

def parseCatalogFile(filename):
    """parse an XML file and build a tree. It's like
       xmlParseFile() except it bypass all catalog lookups. """
    ret = libxml2mod.xmlParseCatalogFile(filename)
    if ret is None:raise parserError('xmlParseCatalogFile() failed')
    return xmlDoc(_obj=ret)