import copy


def get_topic_node_args(node_data):
    """
    Returns (source_id, title) from node_data dictionary.
    """
    node_data = copy.deepcopy(node_data)
    source_id = node_data.pop('source_id')
    title = node_data.pop('title')
    license = node_data.pop('license')
    return source_id, title