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diff --git a/parser/xml/nsISAXDTDHandler.idl b/parser/xml/nsISAXDTDHandler.idl
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+++ b/parser/xml/nsISAXDTDHandler.idl
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Receive notification of basic DTD-related events.
+ *
+ * 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. (If the LexicalHandler is used, these events
+ * must also be reported before the endDTD event.)
+ */
+[scriptable, uuid(4d01f225-6cc5-11da-be43-001422106990)]
+interface nsISAXDTDHandler : nsISupports {
+
+  /**
+   * Receive notification of a notation declaration event.
+   *
+   * It is up to the application to record the notation for later
+   * reference, if necessary; notations may appear as attribute values
+   * and in unparsed entity declarations, and are sometime used with
+   * processing instruction target names.
+   *
+   * At least one of publicId and systemId must be non-null. If a
+   * system identifier is present, and it is a URL, the SAX parser
+   * must resolve it fully before passing it to the application
+   * through this event.
+   *
+   * There is no guarantee that the notation declaration will be
+   * reported before any unparsed entities that use it.
+   *
+   * @param name The notation name.
+   * @param publicId The notation's public identifier, or null if none was
+   *                  given.
+   * @param systemId The notation's system identifier, or null if none was
+   *                  given.
+   */
+  void notationDecl(in AString name,
+                    in AString publicId,
+                    in AString systemId);
+
+  /**
+   * Receive notification of an unparsed entity declaration event.
+   *
+   * Note that the notation name corresponds to a notation reported
+   * by the notationDecl event. It is up to the application to record
+   * the entity for later reference, if necessary; unparsed entities
+   * may appear as attribute values.
+   *
+   * If the system identifier is a URL, the parser must resolve it
+   * fully before passing it to the application.
+   *
+   * @param name The unparsed entity's name.
+   * @param publicId The entity's public identifier, or null if none was
+   *                  given.
+   * @param systemId The entity's system identifier, or null if none was
+   *                  given.
+   * @param notationName The name of the associated notation.
+   */
+  void unparsedEntityDecl(in AString name, in AString publicId,
+                          in AString systemId, in AString notationName);
+};