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The event-driven model of SAX is useful for XML parsing, but it does have certain drawbacks. Virtually any kind of XML validation requires access to the document in full. . 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 attribu
The application moves the cursor forward - 'pulling' the information from the parser as it needs. This is different from an event based API - such as SAX - which 'pushes' data to the application - requiring the application to maintain state between events as necessary to keep track of location within the document.
This allows for writing of recursive descent parsers in which the structure of the code performing the parsing mirrors the structure of the XML being parsed, and intermediate parsed results can be used and accessed as local variables within the functions performing the parsing, or passed down (as function parameters) into lower-level functions ...
In computing, Xerces is Apache's collection of software libraries for parsing, validating, serializing and manipulating XML. The library implements a number of standard APIs for XML parsing, including DOM, SAX and SAX2. The implementation is available in the Java, C++ and Perl programming languages.
the Document Object Model parsing interface or DOM interface; the Simple API for XML parsing interface or SAX interface; the Streaming API for XML or StAX interface (part of JDK 6; separate jar available for JDK 5) In addition to the parsing interfaces, the API provides an XSLT interface to provide data and structural transformations on an XML ...
Many tools can process the exported XML. If you process a large number of pages (for instance a whole dump) you probably won't be able to get the document in main memory so you will need a parser based on SAX or other event-driven methods. You can also use regular expressions to directly process parts of the XML code.
Form, link and image elements could be referenced with a hierarchical name that began with the root document object. A hierarchical name could make use of either the names or the sequential index of the traversed elements. For example, a form input element could be accessed as either document.myForm.myInput or document.forms[0].elements[0].
SAX-type parsing performance of Fast Infoset is also much faster than parsing performance of XML 1.0, even without any Zip-style compression. Typical increases in parsing speed observed for the reference Java implementation are a factor of 10 over Java Xerces, and a factor of 4 over the Piccolo driver (one of the fastest Java-based XML parsers).