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JAXB requires that the XML document you want to access has a schema, and that schema is written in the W3C XML Schema Language (see the box "Why W3C XML Schema Language? Assume, for this example, that the Why W3C XML Schema Language?The W3C XML Schema Language is not the only schema language.The first step in this process is to bind the schema for the XML document into a set of Java classes that represents the schema.Schema: A schema is an XML specification that governs the allowable components of an XML document and the relationships between the components.One way to do this, perhaps the most typical way, is through parsers that conform to the Simple API for XML (SAX) or the Document Object Model (DOM).Both of these parsers are provided by Java API for XML Processing (JAXP).
These documents contain data about books, such as book name, author, description, and ISBN identification number.You could use the SAX or DOM approach to access an XML document and then display the data. In that case, you would need to: After unmarshalling, your program can access and display the data in the XML document simply by accessing the data in the Java content objects and then displaying it.There is no need to create and use a parser and no need to write a content handler with callback methods.What this means is that developers can access and process XML data without having to know XML or XML processing.
JAXB simplifies access to an XML document from a Java program by presenting the XML document to the program in a Java format.
However, the XML Schema Language is much richer than DTDs.