ASentence} objects and
    calls the appropriate receiver method with them.

    @cvar _SENTENCE_CONTENTS: Has the field names in an NMEA sentence for each
        sentence type (in order, obviously).
    @type _SENTENCE_CONTENTS: C{dict} of bytestrings to C{list}s of C{str}
    @param _receiver: A receiver for NMEAProtocol sentence objects.
    @type _receiver: L{INMEAReceiver}
    @param _sentenceCallback: A function that will be called with a new
        L{NMEASentence} when it is created. Useful for massaging data from
        particularly misbehaving NMEA receivers.
    @type _sentenceCallback: unary callable
    Nc