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diff --git a/desktop/source/deployment/registry/component/dp_compbackenddb.hxx b/desktop/source/deployment/registry/component/dp_compbackenddb.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_DESKTOP_SOURCE_DEPLOYMENT_REGISTRY_COMPONENT_DP_COMPBACKENDDB_HXX
+#define INCLUDED_DESKTOP_SOURCE_DEPLOYMENT_REGISTRY_COMPONENT_DP_COMPBACKENDDB_HXX
+
+#include <rtl/ustring.hxx>
+#include <rtl/string.hxx>
+#include <vector>
+#include <deque>
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace dp_registry {
+namespace backend {
+namespace component {
+
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+   The format looks like this:
+
+<?xml version="1.0"?>
+<component-backend-db xmlns="http://openoffice.org/extensionmanager/component-registry/2010">
+  <component url="vnd.sun.star.expand:$UNO_USER_PACKAGES_CACHE/uno_packages/5CD5.tmp_/leaves1.oxt/extensionoptions.jar">
+    <name>FileName</name>
+    <java-type-library>true</java-type-library>
+    <implementation-names>
+      <name>com.sun.star.comp.extensionoptions.OptionsEventHandler$_OptionsEventHandler</name>
+      ...
+    </implementation-names>
+    <singletons>
+      <item>
+        <key>com.sun.star.java.theJavaVirtualMachine</key>
+        <value>com.sun.star.java.JavaVirtualMachine</value>
+      </item>
+      ...
+    </singletons>
+  </component>
+
+  <component ...>
+  ...
+</component-backend-db>
+ */
+class ComponentBackendDb: public dp_registry::backend::BackendDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+    virtual OUString getNSPrefix() override;
+    virtual OUString getRootElementName() override;
+    virtual OUString getKeyElementName() override;
+
+public:
+    struct Data
+    {
+        Data(): javaTypeLibrary(false) {};
+
+        std::deque< OUString> implementationNames;
+        std::vector< std::pair< OUString, OUString> >singletons;
+            // map from singleton names to implementation names
+        bool javaTypeLibrary;
+    };
+
+public:
+
+    ComponentBackendDb( css::uno::Reference<css::uno::XComponentContext> const &  xContext,
+                        OUString const & url);
+
+    void addEntry(OUString const & url, Data const & data);
+
+    Data getEntry(OUString const & url);
+
+
+};
+
+
+}
+}
+}
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */