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Perhaps the easiest part of JAXP to understand, the DOM interface parses an entire XML document and constructs a complete in-memory representation of the document using the classes and modeling the concepts found in the Document Object Model(DOM) Level 2 Core Specification. Unlike the DOM parser, the SAX parser does not create an in-memory representation of the XML document and so runs faster and uses less memory.
Instead, the SAX parser informs clients of the XML document structure by invoking callbacks, that is, by invoking methods on a that overrides these methods and processes the data.
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.
The only reason to continue using JDOM 1.x is for compatibility with older Java versions (back to Java 1.2).
JDOM 2.0.x versions are out, and work is starting on identifying what new features can be added to a future 2.1.x release series.
If you are migrating to JDOM 2.x from previous JDOM versions you will need to change your package imports from * to org.jdom2.* JDOM 1.x versions are operating in maintenance mode only and only bug fixes will be considered for future 1.x releases.It is possible to store a local cache for frequently used documents using an XML Catalog. St AX was designed as a median between the DOM and SAX interface.In its metaphor, the programmatic entry point is a cursor that represents a point within the document.A SAX parser only needs to report each parsing event as it happens, and normally discards almost all of that information once reported (it does, however, keep some things, for example a list of all elements that have not been closed yet, in order to catch later errors such as end-tags in the wrong order).Thus, the minimum memory required for a SAX parser is proportional to the maximum depth of the XML file (i.e., of the XML tree) and the maximum data involved in a single XML event (such as the name and attributes of a single start-tag, or the content of a processing instruction, etc.). A DOM parser, in contrast, has to build a tree representation of the entire document in memory to begin with, thus using memory that increases with the entire document length.