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diff --git a/parser/xml/nsISAXLexicalHandler.idl b/parser/xml/nsISAXLexicalHandler.idl
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+++ b/parser/xml/nsISAXLexicalHandler.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"
+
+/**
+ * SAX2 extension handler for lexical events.
+ *
+ * This is an extension handler for SAX2 to provide lexical
+ * information about an XML document, such as comments and CDATA
+ * section boundaries.
+ *
+ * The events in the lexical handler apply to the entire document,
+ * not just to the document element, and all lexical handler events
+ * must appear between the content handler's startDocument and
+ * endDocument events.
+ */
+[scriptable, uuid(23c26a56-adff-440c-8caf-95c2dc2e399b)]
+interface nsISAXLexicalHandler : nsISupports {
+
+  /**
+   * Report an XML comment anywhere in the document.
+   *
+   * This callback will be used for comments inside or outside the
+   * document element, including comments in the external DTD subset
+   * (if read).  Comments in the DTD must be properly nested inside
+   * start/endDTD and start/endEntity events (if used).
+   *
+   * @param chars The characters in the comment.
+   */
+  void comment(in AString chars);
+
+  /**
+   * Report the start of DTD declarations, if any.
+   *
+   * This method is intended to report the beginning of the
+   * DOCTYPE declaration; if the document has no DOCTYPE declaration,
+   * this method will not be invoked.
+   *
+   * All declarations reported through DTDHandler or DeclHandler
+   * events must appear between the startDTD and endDTD events.
+   * Declarations are assumed to belong to the internal DTD subset
+   * unless they appear between startEntity and endEntity events.
+   * Comments and processing instructions from the DTD should also be
+   * reported between the startDTD and endDTD events, in their
+   * original order of (logical) occurrence; they are not required to
+   * appear in their correct locations relative to DTDHandler or
+   * DeclHandler events, however.
+   *
+   * Note that the start/endDTD events will appear within the
+   * start/endDocument events from ContentHandler and before the first
+   * startElement event.
+   *
+   * @param name The document type name.
+   * @param publicId The declared public identifier for the
+   *        external DTD subset, or null if none was declared.
+   * @param systemId The declared system identifier for the
+   *        external DTD subset, or null if none was declared.
+   *        (Note that this is not resolved against the document
+   *        base URI.)
+   */
+  void startDTD(in AString name, in AString publicId, in AString systemId);
+
+  /**
+   * Report the end of DTD declarations.
+   *
+   * This method is intended to report the end of the
+   * DOCTYPE declaration; if the document has no DOCTYPE declaration,
+   * this method will not be invoked.
+   */
+  void endDTD();
+
+  /**
+   * Report the start of a CDATA section.
+   *
+   * The contents of the CDATA section will be reported through the
+   * regular characters event; this event is intended only to report
+   * the boundary.
+   */
+  void startCDATA();
+
+  /**
+   * Report the end of a CDATA section.
+   */
+  void endCDATA();
+
+  /**
+   * Report the beginning of some internal and external XML entities.
+   *
+   * Because of the streaming event model that SAX uses, some
+   * entity boundaries cannot be reported under any circumstances:
+   *
+   * 1.) general entities within attribute values
+   * 2.) parameter entities within declarations
+   *
+   * These will be silently expanded, with no indication of where
+   * the original entity boundaries were.
+   *
+   * Note also that the boundaries of character references (which
+   * are not really entities anyway) are not reported.
+   *
+   * All start/endEntity events must be properly nested.
+   *
+   * @param name The name of the entity.  If it is a parameter
+   *             entity, the name will begin with '%', and if it is the
+   *             external DTD subset, it will be "[dtd]".
+   */
+  void startEntity(in AString name);
+
+  /**
+   * Report the end of an entity.
+   *
+   * @param name The name of the entity that is ending.
+   */
+  void endEntity(in AString name);
+};