Method GetFeature

The feature name is any fully-qualified URI. It is possible for an XMLReader to recognize a feature name but temporarily be unable to return its value. Some feature values may be available only in specific contexts, such as before, during, or after a parse. Also, some feature values may not be programmatically accessible. (In the case of an adapter for SAX1 {@link Parser}, there is no implementation-independent way to expose whether the underlying parser is performing validation, expanding external entities, and so forth.)

All XMLReaders are required to recognize the http://xml.org/sax/features/namespaces and the http://xml.org/sax/features/namespace-prefixes feature names.

Typical usage is something like this:

XMLReader r = new MySAXDriver();
                        // try to activate validation
try {
   r.SetFeature("http://xml.org/sax/features/validation", true);
} catch (SAXException e) {
   Console.Error.WriteLine("Cannot activate validation."); 
}
                        // register event handlers
r.ContentHandler = new MyContentHandler();
r.ErrorHandler = new MyErrorHandler();
                        // parse the first document
try {
   r.Parse("http://www.foo.com/mydoc.xml");
} catch (IOException e) {
   Console.Error.WriteLine("I/O exception reading XML document");
} catch (SAXException e) {
   Console.Error.WriteLine("XML exception reading document.");
}

Implementors are free (and encouraged) to invent their own features, using names built on their own URIs.