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This chapter assumes that you are familiar with the following technologies: JAXP version 1.2 includes an XSLT framework plus some updates to the parsing API to support DOM Level 2 and SAX version 2.0 and an improved scheme to locate pluggable implementations.JAXP provides support for XML schema and an XSLT compiler.You can access the JAXP specification, which is produced by Sun Microsystems, at the following URL: DOM builds an in-memory tree representation of the XML document.For example, the DOM API receives the document described in Example 3-1 and creates an in-memory tree as shown in Figure 3-2.The input document contains an extra attribute which has not been defined in the XML Schema, this shows that the XML Schema has been used for the validation.When using this XML Schema to validate the input XML document, the following error gets reported: ) as defined below has been used in the code examples to validate the input document.When a Sax parser parses a XML document and every time it encounters a tag it calls the corresponding tag handler methods when it encounter a Start Tag it calls this method public void start Element(String name, Attribute List attrs) when it encounter a End Tag it calls this method public void end Element(String name) This program also parses a XML file and prints it on the console . In this example, the Print Using Sax Class extends the Handler Base class and implemets the call back methods to handle the printing The steps involved are Get a instance of SAX parser, The previous program illustrated how to Parse an existing XML file using both SAX and DOM Parsers.

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The validator will report fatal errors, non-fatal errors and warnings.Configure Java APIs (SAX, DOM, dom4j, XOM) using JAXP 1.3 to validate XML Documents with DTD and Schema(s).Many Java XML APIs provide mechanisms to validate XML documents, the JAXP API can be used for most of these XML APIs but subtle configuration differences exists.6.1.1 Using DOM parses a XML file and prints it on the console . This is a two stage process, first it parses the XML file and creates a tree structure in the memory.The next stage is to traverse the tree and print the contents.

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