'Initialize the SyncMapItemInstance
:returns: twilio.rest.sync.v1.service.sync_map.sync_map_item.SyncMapItemInstance
:rtype: twilio.rest.sync.v1.service.sync_map.sync_map_item.SyncMapItemInstance'

def __init__(self, version, payload, service_sid, map_sid, key=None):

    super(SyncMapItemInstance, self).__init__(version)
    self._properties = {'key': payload['key'], 'account_sid': payload['account_sid'], 'service_sid': payload['service_sid'], 'map_sid': payload['map_sid'], 'url': payload['url'], 'revision': payload['revision'], 'data': payload['data'], 'date_created': deserialize.iso8601_datetime(payload['date_created']), 'date_updated': deserialize.iso8601_datetime(payload['date_updated']), 'created_by': payload['created_by']}
    self._context = None
    self._solution = {'service_sid': service_sid, 'map_sid': map_sid, 'key': (key or self._properties['key'])}
