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diff --git a/dom/xml/nsIXMLContentSink.h b/dom/xml/nsIXMLContentSink.h
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+++ b/dom/xml/nsIXMLContentSink.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+#ifndef nsIXMLContentSink_h___
+#define nsIXMLContentSink_h___
+
+#include "nsIContentSink.h"
+#include "nsISupports.h"
+
+class nsIURI;
+class nsIChannel;
+namespace mozilla::dom {
+class Document;
+}  // namespace mozilla::dom
+
+#define NS_IXMLCONTENT_SINK_IID                      \
+  {                                                  \
+    0x63fedea0, 0x9b0f, 0x4d64, {                    \
+      0x9b, 0xa5, 0x37, 0xc6, 0x99, 0x73, 0x29, 0x35 \
+    }                                                \
+  }
+
+/**
+ * This interface represents a content sink for generic XML files.
+ * The goal of this sink is to deal with XML documents that do not
+ * have pre-built semantics, though it may also be implemented for
+ * cases in which semantics are hard-wired.
+ *
+ * The expectation is that the parser has already performed
+ * well-formedness and validity checking.
+ *
+ * XXX The expectation is that entity expansion will be done by the sink
+ * itself. This would require, however, that the sink has the ability
+ * to query the parser for entity replacement text.
+ *
+ * XXX This interface does not contain a mechanism for the sink to
+ * get specific schema/DTD information from the parser. This information
+ * may be necessary for entity expansion. It is also necessary for
+ * building the DOM portions that relate to the schema.
+ *
+ * XXX This interface does not deal with the presence of an external
+ * subset. It seems possible that this could be dealt with completely
+ * at the parser level.
+ */
+
+class nsIXMLContentSink : public nsIContentSink {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IXMLCONTENT_SINK_IID)
+  virtual bool IsPrettyPrintXML() const { return false; }
+  virtual bool IsPrettyPrintHasSpecialRoot() const { return false; }
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIXMLContentSink, NS_IXMLCONTENT_SINK_IID)
+
+nsresult NS_NewXMLContentSink(nsIXMLContentSink** aInstancePtrResult,
+                              mozilla::dom::Document* aDoc, nsIURI* aURL,
+                              nsISupports* aContainer, nsIChannel* aChannel);
+
+#endif  // nsIXMLContentSink_h___