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> > > There is nothing that requires a DOM tree to be held in memory other > > > than the DOM implementation itself. Lazy DOMs allow you to > > > incrementally retrieve and traverse DOM trees, I believe the Xerces > > > project was working on such a beast, and the dbXML DOM is partially a > > > lazy DOM. > > > >Yep. 4Suite's DbDom is also a lazy DOM. I agree that the claims quoted > >from the article are disingenuous. > > Is it not true, however, that for applications such > as XSLT, almost all of the DOM would end up loaded in > memory? > > In my understanding, lazy DOMs only save memory if > many of the nodes are not accessed at all. > > Is this the case? No. For instance, DbDOM is based on an ODMG object database implementation. The storage manager implements a caching scheme which allows nodes to be aged and rotated out. Cache management is quite a difficult area, but quite established, so I'd bet most persistent DOMs have such swapping schemes. -- Uche Ogbuji Principal Consultant uche.ogbuji@f... +1 303 583 9900 x 101 Fourthought, Inc. http://Fourthought.com 4735 East Walnut St, Ste. C, Boulder, CO 80301-2537, USA Software-engineering, knowledge-management, XML, CORBA, Linux, Python
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