def list(condition=(), order=''):
    """return a list of data records satisfying *condition* ordered by *order*.

    *condition* is a sequences of tuples *field*, *value*, *op*
    (with *op* optional, defaulting to `=`).

    *order* is a blank separated sequence of field names, optionally with suffix
    `+` (default: order increasing) or `-` (order descreasing).
    
    *order* is combined with the default ordering.
    """
