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On Sunday 30 October 2005 16:50, Ariya Hidayat wrote:
> I'd like to give a try to implement alternative DOM implementation
> which does not consume as much memory as typical QDom classes.=20

Cool!!

> The idea is as follows. Each node does not necessarily load the
> attributes and its children at once, but rather only on-demand. Upon
> loading the main document, only information about the first level
> nodes/elements (which are children of the document) are loaded.=20

Yes, that sounds good.

> Node can also have unload() method which explicitly purged its data
> from memory. This is useful when the program knows it will not use the
> node anymore.

=46ine for a first version; I was more thinking of having a pool of objects=
=20
(with attributes as well as nodes) and when the pool is full the ones=20
longest not accessed will be automatically deleted.

> I expect a performance degradation since parsing needs to be performed
> many times.=20

The slow part in XML parsing are things like the conversion of file-bytes=20
to encoded text to integers.  Doing this lazily will probably save a lot=20
of time.

> However, I estimate that memory requirement will be much=20
> less. My guess is that this is worth doing it.

I agree.

> So I'm starting to work on this, and comments are warmly appreciated.

If you have an initial setup (i.e. non crashing :), feel free to post it=20
somewhere with the unit tests so we can play with it and provide=20
feedback.

Thanks for picking this up!
=2D-=20
Thomas Zander

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