Define validating parser

Other tasks, such as sorting, rearranging sections, getting from a link to its target, looking up information on one element to help process a later one and the like require accessing the document structure in complex orders and will be much faster with DOM than with multiple SAX passes.Some implementations do not neatly fit either category: a DOM approach can keep its persistent data on disk, cleverly organized for speed (editors such as Soft Quad Author/Editor and large-document browser/indexers such as Dyna Text do this); while a SAX approach can cleverly cache information for later use (any validating SAX parser keeps more information than described above).The event-driven model of SAX is useful for XML parsing, but it does have certain drawbacks.

Many parsers, for example, return separate text events for numeric character references.Such implementations blur the DOM/SAX tradeoffs, but are often very effective in practice.Due to the nature of DOM, streamed reading from disk requires techniques such as lazy evaluation, caches, virtual memory, persistent data structures, or other techniques (one such technique is disclosed in US patent 5557722).The most trivial example is that an attribute declared in the DTD to be of type IDREF, requires that there be only one element in the document that uses the same value for an ID attribute.To validate this in a SAX parser, one must keep track of all ID attributes (any one of them might end up being referenced by an IDREF attribute at the very end); as well as every IDREF attribute until it is resolved.

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