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In the DOM processing model, the parser casts the XML document into a tree-like data structure (see Figure 11.9). You write code to traverse the tree. Most commonly, processing the XML input data involves two steps: 1. The DOM parser generates a tree-like data structure that models the XML source document. This structure is called a DOM tree. 2. The application searches for the relevant information in the tree and extracts, consolidates, and processes it further. Then the application can create domain-speci c objects from the consolidated data. The cycle for searching, extracting, and processing can be repeated as many times as is needed because the DOM tree persists in memory. There are some limitations to the use of the DOM processing model. The DOM model was designed to be a platform- and language-independent interface. Because of this, the Java binding of the DOM API is not particularly Java friendly. For example, the binding does not use the java.util.Collection API. However, in general, it is slightly easier to use than the SAX model. A great advantage of the DOM parser is that most implementations of this parser allow both marshalling and unmarshalling of the XML document. In addition, XSLT identity transformation can be used to achieve serialization back to the XML document.
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Another convenience for developers is the use of XPath in conjunction with the DOM processing model. XPath can be used to locate and extract information from a source document DOM tree. By allowing you to specify path patterns to locate element content, attribute values, and subtrees, XPath not only greatly simplifies but may even eliminate tree-transversal code. Because XPath expressions are strings, they can be easily parameterized and externalized in a configuration file. Consequently, more generic and reusable programs can be created. In summary, the DOM processing model should be used when any of the followings conditions exist:
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You want to process or generate XML documents. You want to process the XML document more than once. The document is not very large and memory usage is not an issue. You want to manipulate an XML document and need ne-grained control over the document structure that you want to create or edit. You want random access to parts of the document. For example, you want to go back and forth within the document. You want to bene t from the exibility of XPath and apply XPath expressions on the DOM tree. You want to implement data binding but you cannot use JAXB technology because the document either has no schema or it conforms to a DTD schema de nition rather than to an XSD schema de nition.
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In contrast to the SAX, StAX, and DOM processing models, the XML data-binding processing model allows the processing of the content of an XML document without being concerned with XML document representation (infosets or meta-data). In this processing model (as implemented by JAXB technology), first a binding compiler is used, which binds a source XSD schema to schemaderived Java content classes, as shown in Figure 11.10. JAXB binds an XML namespace to a Java package. In the next step of processing, the XSD schema instance documents can be unmarshaled into a tree of Java objects, as shown in the following Figure 11.11. The Java objects created are the instances of the Java classes generated by the binding compiler using the XSD schema. Applications can access the content of the source document using Java Bean style getter and setter accessor methods. Furthermore, you can create or edit in-memory content tree and then marshal the tree into an XML document instance of the source schema. During the process of marshalling or unmarshalling, validation can be performed to ensure that the document about to be processed or created satisfies the constraints expressed in the XSD schema. The following steps are involved in using JAXB schema derived classes to process an incoming XML document: 1. Set up the JAXB context (JAXBContext) with the list of schemaderived packages that are used to unmarshal the document. 2. Unmarshal an XML document into a content tree. Also, perform the validation of the document if enabled by the application. 3. Directly apply the business logic to the content tree or extract and consolidate information from the content tree and then apply the business logic on the consolidated information. This consolidated information may very well be domain-speci c objects that expose a more adequate, schema-independent interface. This processing model also supports serialization to XML (see Figure 11.12). In other words, it supports marshalling a content tree to
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