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Getting to Know the API
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The Xerces API documentation is available in both the source-code and binary distributions When the Xerces library is installed, the API documentation can be found inside the apiDocs folder, which is located inside the doc folder Whereas the rest of the Xerces documentation is available in XML, HTML, and PDF formats, the documentation for the programming interfaces is currently available only in HTML form There is a brief programming guide available; the file \doc\html\programhtml describes some general characteristics of programming Xerces This information can also be found in the PDF and XML documentation The API documentation provided with Xerces is mostly reference material gathered from the various source code header files and does not provide much detail on the usage of the various classes Thankfully, Xerces ships with a number of useful examples, and you should familiarize yourself with them before attempting you build your first application Table 6-1 lists the sample applications that ship with the Xerces distribution and what they demonstrate One of the major differences between the Java and C++ APIs are the DOM class names In the C++ version of the API, the various DOM class names are prefixed with DOM_ For example, the Document class becomes DOM_Document, the Node class becomes DOM_Node, and so on According to the Xerces documentation, this
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The Document Object Model: Processing Structured Documents
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CreateDOMDocument DOMCount DOMPrint SAXCount SAXPrint MemParse Redirect Pparse StdInParse EnumVal SenumVal SAX2Count SAX2Print IDOMCount IDOMPrint Table 6-1
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Uses the DOM API to create a new document and add elements to it Parses an XML file and counts the number of elements in it Parses and prints the contents of an XML file Uses the SAX (Simple API for XML) interface to parse an XML file and count its elements Uses the SAX interface to parse an XML file and print its contents Demonstrates parsing an XML file that is stored in a memory buffer Shows how to use the EntityResolver class to redirect the parser to an external DTD file Demonstrates the technique of progressive parsing, in which an input stream is parsed a piece at a time Parses an XML file that is read from standard input Illustrates how to enumerate the values defined in a DTD Grammar Same as EnumVal, but enumerates values defined in a Schema Grammar Uses the SAX2 interface to parse an XML file and count its elements Uses the SAX2 interface to parse an XML file and print its contents Demonstrates parsing an XML file and counting its elements using the new, experimental IDOM interfaces Uses the experimental IDOM interfaces to parse and print the contents of an XML file
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The Xerces Sample Applications
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is done to avoid collisions with existing code that might try to use the same class names, either in the application or some other third-party libraries that the application is using This could have been avoided using C++ namespaces, of course, but the Xerces documentation notes that there are still several C++ compilers that do not yet use namespaces If you are so inclined, you could always use typedef declarations to rename the C++ classes to be the same as their Java counterparts, such as
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typedef DOM_Document Document; typedef DOM_Node Node; typedef DOM_Element Element;
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This technique may be particularly useful to developers converting a body of existing Xerces Java code to C++
6: Applications
Aside from the class name differences, programming Xerces in C++ is very similar to programming Xerces in Java, and a great deal of effort went into making the two as similar as possible Most of the memory management is done automatically behind the scenes by the library, and the built-in DOM classes are implemented using object reference counting For the most part, your code will not have to do any explicit object deletion For this reason, there are some important points you need to keep in mind when writing Xerces C++ applications: Always create DOM classes as local variables on the stack, or as member variables of another class Do not try to create them on the heap using new() or malloc() because this will cause the internal automatic memory management mechanism to become confused and will most likely lead to objects not being freed correctly In other words, do this:
DOM_Document myNode = theDOMImplcreateDocument(0,"root",DOM_DocumentType());
Not this:
DOM_Document *myDocument = new DOM_Document();
The public DOM classes can be copied via the assignment operator (=), passed as function parameters, and returned from functions by value, just as they can be in Java You should not try to subclass the public DOM classes (for example, DOM_Node, DOM_Document, DOM_Attr, and so on) In practice, this is almost never necessary anyway If you need to attach application-specific data to a DOM document tree, the DOM_Node class provides a user data field that your application can use to store this data You ll see an example of this later in the chapter in the Using the Node s userData Field section
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