Stax validating parser
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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.
Current features being considered are improved XPath support (XPath 2.0) and updated XSLT processing, and also an extended St AX Handling API.
Because of the event-driven nature of SAX, processing documents is generally far faster than DOM-style parsers, so long as the processing can be done in a start-to-end pass.
Many tasks, such as indexing, conversion to other formats, very simple formatting, and the like, can be done that way.
It analyzes the whole document, and provides access to the Tree elements (DOM).
This type of parser is a better option for smaller XML documents, but not for large XML document as it causes major performance issues.
This type of parser is well suited for large XML documents.
SAX provides a mechanism for reading data from an XML document that is an alternative to that provided by the Document Object Model (DOM).
Where the DOM operates on the document as a whole, i.e.
building the full AST of XML document for convenience of the user, SAX parsers operate on each piece of the XML document sequentially, issuing parsing events while making single pass through the input stream.
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.
We've come a long way from the initial code donations in 1999, starting as a member of the XML project, eventually becoming a top-level project in 2005, over the years creating new generations of Xerces Java and C within the community, with many releases and hopefully many more in the years to come.