// -*- C++ -*-

//=============================================================================
/**
 *  @file    DTDHandler.h
 *
 *  @author Nanbor Wang <nanbor@cs.wustl.edu>
 */
//=============================================================================
#ifndef _ACEXML_DTDHANDLER_H_
#define _ACEXML_DTDHANDLER_H_

#include /**/ "ace/pre.h"
#include "ACEXML/common/ACEXML_Export.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ACEXML/common/SAXExceptions.h"

/**
 * @class ACEXML_DTDHandler
 *
 * @brief ACEXML_DTDHandler
 *
 * If a SAX application needs information about notations and unparsed
 * entities, then the application implements this interface and registers
 * an instance with the SAX parser using the parser's setDTDHandler method.
 * The parser uses the instance to report notation and unparsed entity
 * declarations to the application.
 *
 * Note that this interface includes only those DTD events that the XML
 * recommendation requires processors to report: notation and unparsed
 * entity declarations.
 *
 * The SAX parser may report these events in any order, regardless of the
 * order in which the notations and unparsed entities were declared;
 * however, all DTD events must be reported after the document handler's
 * startDocument event, and before the first startElement event.
 *
 * It is up to the application to store the information for future use
 * (perhaps in a hash table or object tree). If the application encounters
 * attributes of type "NOTATION", "ENTITY", or "ENTITIES", it can use the
 * information that it obtained through this interface to find the entity
 * and/or notation corresponding with the attribute value.
 */
class ACEXML_Export ACEXML_DTDHandler
{
public:

  virtual ~ACEXML_DTDHandler (void);

  /**
   * Receive notification of a notation declaration event.
   */
  virtual void notationDecl (const ACEXML_Char *name,
                             const ACEXML_Char *publicId,
                             const ACEXML_Char *systemId) = 0;

  /**
   * Receive notification of an unparsed entity declaration event.
   */
  virtual void unparsedEntityDecl (const ACEXML_Char *name,
                                   const ACEXML_Char *publicId,
                                   const ACEXML_Char *systemId,
                                   const ACEXML_Char *notationName) = 0;
};


#include /**/ "ace/post.h"

#endif /* _ACEXML_DTDHANDLER_H_ */
