diff -r 000000000000 -r 6474c204b198 parser/xml/public/nsISAXXMLFilter.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/xml/public/nsISAXXMLFilter.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- 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"
+#include "nsISAXXMLReader.idl"
+
+/**
+ * Interface for an XML filter.
+ *
+ * An XML filter is like an XML reader, except that it obtains its
+ * events from another XML reader rather than a primary source like an
+ * XML document or database.  Filters can modify a stream of events as
+ * they pass on to the final application.
+ */
+[scriptable, uuid(77a22cf0-6cdf-11da-be43-001422106990)]
+interface nsISAXXMLFilter : nsISAXXMLReader {
+  
+  /**
+   * The parent reader.
+   *
+   * Allows the application to query the parent reader (which may be
+   * another filter).  It is generally a bad idea to perform any
+   * operations on the parent reader directly: they should all pass
+   * through this filter.
+   */
+  attribute nsISAXXMLReader parent;
+};