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List:       koffice-devel
Subject:    Re: DOM tree with on-demand loading
From:       Thorsten Zachmann <t.zachmann () zagge ! de>
Date:       2005-12-21 7:22:27
Message-ID: 200512210822.29302.t.zachmann () zagge ! de
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Hello all,

> I have committed the very draft version of DOM implementation which
> supports on-demand loading. It is in
> lib/kofficecore/koxmlreader.{h,cpp} with corresponding test in
> lib/kofficecore/tests/koxmlreadertest.cpp. As you can see, I try to
> follow QDom's API as close as possible to ease the migration.

In the latest edition of the c't a German comuter magazine there was an 
article about VDT-XML (http://vtd-xml.sourceforge.net/) as far as I can see 
it does exactly what are we looking for. Here some part of the homepage:

  Designed to be random-access capable, VTD-XML attempts to be both 
high-performance and memory-efficient. In addition, because VTD is inherently 
persistent, it can be saved on disk alongside of the XML document to achieve 
"parse-once, use many times." Moreover, the "non-extractive" nature of VTD 
means that incremental, dynamic update doesn't require re-serialization of 
irrelevant parts of the original document.  
  On a 1.5gHz Athlon PC, VTD-XML consistently outperforms SAX parsers with 
NULL content handler, delivering 25~35 MB/sec sustained throughput, without 
sacrificing random access. Its memory usage is typically between 1.3x~1.5 x 
the size of the XML document, with 1 being the XML itself. 

I did not test it by myself but looks quite promising.

Have a nice day,

Thorsten
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