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diff --git a/src/polkit/polkitsubject.h b/src/polkit/polkitsubject.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
+
+/*
+ * Copyright (C) 2008 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: David Zeuthen <davidz@redhat.com>
+ */
+
+#if !defined (_POLKIT_COMPILATION) && !defined(_POLKIT_INSIDE_POLKIT_H)
+#error "Only <polkit/polkit.h> can be included directly, this file may disappear or change contents."
+#endif
+
+#ifndef __POLKIT_SUBJECT_H__
+#define __POLKIT_SUBJECT_H__
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define POLKIT_TYPE_SUBJECT            (polkit_subject_get_type ())
+#define POLKIT_SUBJECT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), POLKIT_TYPE_SUBJECT, PolkitSubject))
+#define POLKIT_IS_SUBJECT(obj)	 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), POLKIT_TYPE_SUBJECT))
+#define POLKIT_SUBJECT_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), POLKIT_TYPE_SUBJECT, PolkitSubjectIface))
+
+/**
+ * PolkitSubject:
+ *
+ * An abstract type that specifies a subject.
+ **/
+typedef struct _PolkitSubject      PolkitSubject;
+typedef struct _PolkitSubjectIface PolkitSubjectIface;
+
+/**
+ * PolkitSubjectIface:
+ * @g_iface: The parent interface.
+ * @equal: Checks if two #PolkitSubject<!-- -->s are equal.
+ *
+ * #PolkitSubjectIface is used to implement #PolkitSubject types for various
+ * different subjects
+ */
+struct _PolkitSubjectIface
+{
+        GTypeInterface g_iface;
+
+        /* Virtual Table */
+
+        gboolean (* equal) (PolkitSubject *subject1,
+                            PolkitSubject *subject2);
+};
+
+GType    polkit_subject_get_type  (void) G_GNUC_CONST;
+gboolean polkit_subject_equal     (PolkitSubject  *subject1,
+                                   PolkitSubject  *subject2);
+
+G_END_DECLS
+
+#endif /* __POLKIT_SUBJECT_H__ */