def METHOD_NAME(self):
    id = self.meta.get_schema().get("sid", "id")
    header = self.meta.get_schema().get("header", [])
    id_delimiter = self.meta.get_id_delimiter()
    if not header:
        feature_list = []
    elif isinstance(header, str):
        feature_list = header.split(id_delimiter)
    elif isinstance(header, list):
        feature_list = header
    else:
        feature_list = [header]
    if self.meta.get_extend_sid():
        id = feature_list[0]
        if len(feature_list) > 1:
            feature_list = feature_list[1:]
    return id, feature_list, id_delimiter