Interface for reading an XML document using callbacks.

 nsISAXXMLReader is the interface that an XML parser's SAX2
 driver must implement.  This interface allows an application to set
 and query features and properties in the parser, to register event
 handlers for document processing, and to initiate a document
 parse.
[scriptable, uuid(5556997e-d816-4218-8b54-803d4261206e)]
interface nsISAXXMLReader : nsIStreamListener

Attributes

 The base URI.
attribute nsIURI baseURI
 If the application does not register a content handler, all
 content events reported by the SAX parser will be silently
 ignored.

 Applications may register a new or different handler in the
 middle of a parse, and the SAX parser must begin using the new
 handler immediately.
attribute nsISAXContentHandler contentHandler
 If the application does not register a DTD handler, all DTD
 events reported by the SAX parser will be silently ignored.

 Applications may register a new or different handler in the
 middle of a parse, and the SAX parser must begin using the new
 handler immediately.
attribute nsISAXDTDHandler dtdHandler
 If the application does not register an error handler, all
 error events reported by the SAX parser will be silently ignored;
 however, normal processing may not continue.  It is highly
 recommended that all SAX applications implement an error handler
 to avoid unexpected bugs.

 Applications may register a new or different handler in the
 middle of a parse, and the SAX parser must begin using the new
 handler immediately.
attribute nsISAXErrorHandler errorHandler
 If the application does not register a lexical handler, all
 lexical events (e.g. startDTD) reported by the SAX parser will be
 silently ignored.

 Applications may register a new or different handler in the
 middle of a parse, and the SAX parser must begin using the new
 handler immediately.
attribute nsISAXLexicalHandler lexicalHandler

Methods

 Look up the value of a feature flag. NOT CURRENTLY IMPLEMENTED.

 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.

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

 @param name String flag for a parser feature.
boolean getFeature(in AString name)
 Look up the value of a property. NOT CURRENTLY IMPLEMENTED.

 The property name is any fully-qualified URI.  It is
 possible for an XMLReader to recognize a property name but
 temporarily be unable to return its value.
 Some property values may be available only in specific
 contexts, such as before, during, or after a parse.

 XMLReaders are not required to recognize any specific
 property names, though an initial core set is documented for
 SAX2.

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

 @param name The property name, which is a fully-qualified URI.
 @return The current value of the property.
boolean getProperty(in AString name)
 Begin an asynchronous parse. This method initializes the parser,
 and must be called before any nsIStreamListener methods. It is
 then the caller's duty to call nsIStreamListener methods to drive
 the parser. Once this method is called, the caller must not call
 one of the other parse methods.

 @param observer The nsIRequestObserver to notify upon start or stop.
                 Can be NULL.
void parseAsync(in nsIRequestObserver observer)

 @param stream The byte stream whose contents are parsed
 @param charset The character set that was used to encode the byte
                stream. NULL if not specified.
 @param contentType The content type of the string - either text/xml,
                    application/xml, or application/xhtml+xml.
                    Must not be NULL.

void parseFromStream(in nsIInputStream stream, in string charset, in string contentType)

 @param str The UTF16 string to be parsed
 @param contentType The content type of the string (see parseFromStream)

void parseFromString(in AString str, in string contentType)
 Set the value of a feature flag. NOT CURRENTLY IMPLEMENTED.

 The feature name is any fully-qualified URI.  It is possible
 for an XMLReader to expose a feature value but to be unable to
 change the current value.  Some feature values may be immutable
 or mutable only in specific contexts, such as before, during, or
 after a parse.

 All XMLReaders are required to support setting
 http://xml.org/sax/features/namespaces to true and
 http://xml.org/sax/features/namespace-prefixes to false.

 @param name String flag for a parser feature.
 @param value Turn the feature on/off.
void setFeature(in AString name, in boolean value)
 Set the value of a property. NOT CURRENTLY IMPLEMENTED.

 The property name is any fully-qualified URI.  It is possible
 for an XMLReader to recognize a property name but to be unable to
 change the current value.  Some property values may be immutable
 or mutable only in specific contexts, such as before, during, or
 after a parse.

 XMLReaders are not required to recognize setting any specific
 property names, though a core set is defined by SAX2.

 This method is also the standard mechanism for setting
 extended handlers.

 @param name String flag for a parser feature
 @param value Turn the feature on/off.
void setProperty(in AString name, in nsISupports value)