itextsharp barcode vb net 1: Introduction to the DOM in Java

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1: Introduction to the DOM
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// Introduced in DOM Level 2: Document createDocument(in DOMString namespaceURI, in DOMString qualifiedName, in DocumentType doctype) raises(DOMException); // Introduced in DOM Level 3: DOMImplementation getInterface(in DOMString feature); };
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Second, the interfaces specified in the DOM spec are an abstraction, similar to the way one might use abstract base classes in C++ or interfaces in Java They are simply a way of describing how to access and manipulate an application s internal representation of a given object Interfaces and this is taken directly from the spec do not imply a particular concrete implementation Remember, each DOM application is free to maintain whatever internal representation of document objects it feels is best for that application, as long as the interfaces in the DOM spec are respected Finally, the DOM is designed to be implemented in any language and avoid implementation dependencies, and the DOM spec particularly calls out four important points relevant to this fact:
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1 Attributes defined in the IDL do not imply concrete objects which must have
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specific data members In other words, just because the spec specifies an attribute attr on interface intr does not necessarily mean your code can access it using the code form intrAttr Many DOM implementations translate this notation to a pair of setxxx() and getxxx() functions, that is, intrgetAttr() and intrsetAttr() Attributes that are read-only will have only a corresponding get() function
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2 DOM applications may provide additional interfaces and objects not found in
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this specification and still be considered DOM conformant This is important: the DOM was designed to be extensible from the beginning, and the decision was made that application vendors could add their own interfaces to a particular implementation without breaking conformance to the spec This allows vendors the freedom and flexibility to add convenient, differentiating features to their DOM implementations
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3 Because we specify interfaces and not the actual objects that are to be created,
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the DOM cannot know what constructors to call for an implementation
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The Document Object Model: Processing Structured Documents
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Basically, the spec is saying here that the objects that are specified by the DOM are implementation specific, and they will only provide interfaces for creating those objects The DOM spec provides interfaces in the form of createxxx() on the Document interface, where xxx is the type of document object to be created
4 The DOM spec does not specify multithreading mechanisms
This is pretty self-explanatory The DOM specification does not specify anything having to do with multithreading or other thread-safety topics For the moment, this is left up to individual implementations
What the DOM Isn t
Now that we ve spent the better part of the chapter discussing what the DOM is, we ll take a moment and point out a few of the things that the DOM is not (in fact, the actual W3C specification goes out of its way to do pretty much the same thing perhaps they wanted to avoid any misconceptions of the DOM as early as possible): The DOM isn t a way of creating programs that are, in the spec s words, binary compatible, in other words, usable across disparate computer systems without recompiling Programs that are written using the same language binding will be source-code compatible across platforms, but you can t take a DOM program written for Windows and run it on a Macintosh without recompiling it, for example The DOM doesn t describe how to persist objects into XML or HTML, like SOAP (Simple Object Access Protocol) does, for example It represents documents as a collection of objects The DOM isn t a set of specific data structures It merely describes relationships in a logical fashion Even though the DOM specification (and this book) will talk about such things as parent-child relationships of objects, they are logical relationships and do not describe any internal representation of objects or data The DOM does not describe what information in a document is relevant or how that information is structured; that s what XML Infoset does The DOM is just an API to this information
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