def load(self, xml_file, max_depth=None, backup=None):
"""
Load an xml file
:param xml_file: str -- path of the xml file to load
:param max_depth: int -- maximum depth for sequence creation
:param backup: str -- path of the xml backup file
"""
if self.loaded and self.started:
if not self.interrupted:
return
self.wait()
xml_sequence = parse_sequence_file(xml_file, max_depth, backup)
self.sequence = RootSequenceThread(xml_sequence)
self.loaded = True
self.started = False
self.interrupted = False
