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// Example: different ways of communicating data to handlers // STL based attribute passing // with an STL based event-driven handler a start Element Handler // method might look like this virtual void Hypothetical Handler::start Element Handler (const String name,const list attributes) = 0; // Special Attribute List Class provided // With some event-driven APIs a special Attribute List object // containing attribute information // is used. virtual void Document Handler::start Element(const XMLCh* const name, Attribute List& attrs) = 0; As you can see, the way processors notify applications about elements, attributes, character data, processing instructions and entities is parser-specific and can greatly influence the programming style behind the XML-related modules of your system.
Efforts to create a standard event-driven XML processing API have produced SAX (the Simple API for XML).
In the previous example, the user Data is employed to keep track of the indentation level that should be used when printing elements and attributes to the standard output.
Expat has many advantages: it is very fast and very portable.
Note that here the term event-driven means a process that calls specific handlers when the contents of the XML document are encountered.
The aim of this article is to introduce and analyze the different options available when using C for your XML applications.A standard interface for SAX in C has not yet been developed.Nevertheless, the importance and growing use of SAX in C XML based applications is unquestionable, and makes it an important topic in our discussion.IBM's parser will be re-released at the end of this year as "Xerces," part of the new Apache XML Project.
Expat is a C parser developed and maintained by James Clark.
The various XML parser implementations differ in their application program interfaces.