Java non validating dom parser
At the core of the DOM API are the Document and Node interfaces.
A Document is a top level object that represents an XML document.
I real life application, you will use this information for some real purpose rather than printing it on console and leave.
//Get Document Builder Document Builder Factory factory = Document Builder Instance(); Document Builder builder = Document Builder(); //Build Document Document document = builder.parse(new File("employees.xml")); //Normalize the XML Structure; It's just too important !!
The Document holds the data as a tree of Nodes, where a Node is a base type that can be an element, an attribute, or some other type of content. Nodes represent a single piece of data in the tree, and provide all of the popular tree operations.
Among all the above mapping techniques JAVA mappings improves the performance and are preferred as they gets executed on J2ee engine directly.
In the Java programming language, you can instantiate the parsers by using the Java API for XML Parsing (JAXP). DOM and SAX can either be a validating or a non validating parser.
A validating parser checks the XML file against the rules imposed by DTD or XML Schema.
A SAX processor will pass the following events to a Document Handler: Advantages: (1) It is good when random access to widely separated parts of a document is required.
(2) It supports both read and write operations Disadvantage: (1) It is memory inefficient Because DOM consumes more memory to construct the XML tree Object in the memory corresponding to the input XML its not advisable to use for parsing large XML documents In that case SAX is preferred over DOM. (2) It is memory efficient as SAX parser does not keep any of the document tree in memory.
Those events are passed to event handlers, which provide access to the contents of the document.