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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def process_document_events(events, use_buffers=True):
    ''' Create a JSON string describing a patch to be applied as well as
    any optional buffers.

    Args:
      events : list of events to be translated into patches

    Returns:
      str, list :
        JSON string which can be applied to make the given updates to obj
        as well as any optional buffers

    '''

    json_events = []
    references = set()

    buffers = [] if use_buffers else None

    for event in events:
        json_events.append(event.generate(references, buffers))

    json = {
        'events'     : json_events,
        'references' : references_json(references),
    }

    return serialize_json(json), buffers if use_buffers else []