pool XML format, was: Re: [PD] re: state saving

Adam Lindsay atl at comp.lancs.ac.uk
Mon Dec 1 18:14:39 CET 2003

Thomas Grill said this at Mon, 1 Dec 2003 17:31:37 +0100:

>The main reason is that a key can be any PD atom (except symbols with
>spaces) in pool, and XML attributes must not contain certain characters
>(like ' or " , probably others). The format looks a bit more general and
>robust to me than the one with the attributes. It also _looks_ more

It isn't, really. I was hoping to steer you away from this because it
resembles Apple's property-list format, and that's a bit of a pain to
deal with. However, the fact that you enclose keys and values within a
parent value or dir element makes things a lot easier than Apple's
format. I'm not sure I'd call it transformation-friendly, but it allows
for XPath expressions like this:

(Give me the data for the key #2 that's in any directory with the key bla.)

The interesting aspect of this format is that it allows you to reverse
the lookup with minimal effort:
(Give me the key for all data values that equal 51.)

Who knows if that functionality is actually useful for us, though...

Yeah, looks good! I can deal with it, and it does seem more sensible than
putting the keys in attributes.

 Adam T. Lindsay                      atl at comp.lancs.ac.uk
 Computing Dept, Lancaster University   +44(0)1524/594.537
 Lancaster, LA1 4YR, UK             Fax:+44(0)1524/593.608

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