rbourret at ito.tu-darmstadt.de
Fri Dec 11 10:05:56 GMT 1998
Michael Kay wrote:
> > From: W. Eliot Kimber
> > Remember that notations do not affect the *parsing* of the data, only
> > semantic interpretation.
> If that is so, I am back to square zero in my understanding of notations!
> For example, I thought that if I wanted to put MIDI data in an XML
> I would use notations to the indicate the fact. But I can't semantically
> interpret MIDI data (or even hear the music) before I've parsed it. The
> notation is surely there to tell me that it's MIDI, not that it's
I think what Eliot means is that a generic parser does not treat the
notated (notationized? annotated?) data any differently. (In fact, a
non-validating parser might not even know that it carries a notation.) The
parser parses the data in the same way it parses any other character data
and passes it to the application. It is then up to the *application* to
interpret the data according to the notation.
For example, assuming MIDI data is binary, it might carry two notations.
The first would indicate that it is base64-encoded -- remember that this
is still character data -- and the second would indicate that it is MIDI
data. Based on the first notation, the application would pass the
character data to a base64 decoder to translate it to binary. Based on the
second notation, the application would pass the now-binary data to a MIDI
application, which could play it for your enjoyment.
-- Ron Bourret
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