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In the DOM approach, the parser creates a tree of objects that represents the content and organization of data in the document. The application can then navigate through the tree to access the data it needs, and if appropriate, manipulate it.Now developers have another Java API at their disposal that can make it easier to access XML documents: Java Architecture for XML Binding (JAXB).In fact, the XML specification describes document-type definitions (DTDs) as the way to express a schema.In addition, pre-release versions of the JAXB Reference Implementation worked only with DTDs -- that is, not with schemas written in the XML Schema Language.Here's a command you can use to run the script that binds the schema: subdirectory).Note that these classes are implementation-specific -- in this example, they are specific to the Reference Implementation.
Suppose too that you're working in the Solaris Operating Environment.All JAXB implementations provide a tool called a binding compiler to bind a schema (the way the binding compiler is invoked can be implementation-specific).For example, the JAXB Reference Implementation provides a binding compiler that you can invoke through scripts.In the SAX approach, the parser starts at the beginning of the document and passes each piece of the document to the application in the sequence it finds it. The application can take action on the data as it gets it from the parser, but it can't do any in-memory manipulation of the data.For example, it can't update the data in memory and return the updated data to the XML file.
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?