code: def load_filename(filename, verbose = False, **kwargs):
  	
  	if verbose:
  		print >>sys.stderr, "reading %s ..." % (("'%s'" % filename) if filename is not None else "stdin")
  	if filename is not None:
  		fileobj = open(filename, "rb")
  	else:
  		fileobj = sys.stdin
  	xmldoc, hexdigest = load_fileobj(fileobj, **kwargs)
  	if verbose:
  		print >>sys.stderr, "md5sum: %s  %s" % (hexdigest, (filename if filename is not None else ""))
  	return xmldoc
docs: Parse the contents of the file identified by filename, and return
  	the contents as a LIGO Light Weight document tree.  stdin is parsed
  	if filename is None.  Helpful verbosity messages are printed to
  	stderr if verbose is True.  All other keyword arguments are passed
  	to load_fileobj(), see that function for more information.  In
  	particular note that a content handler must be specified.
  
  	Example:
  
  	>>> from pycbc_glue.ligolw import ligolw
  	>>> xmldoc = load_filename("demo.xml", contenthandler = ligolw.LIGOLWContentHandler, verbose = True)