def is_pds4_identifier(identifier):
    """
    Determines if the provided identifier corresponds to the PDS4 LIDVID format
    or not.

    Parameters
    ----------
    identifier : str
        The identifier to check.

    Returns
    -------
    True if the identifier is a valid PDS4 identifier, False otherwise.

    """
    if identifier.startswith("urn:nasa:pds"):
        return True

    return False