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diff --git a/src/planner.h b/src/planner.h
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+/*
+ * Copyright 2013 Canonical Ltd.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __INDICATOR_DATETIME_PLANNER__H__
+#define __INDICATOR_DATETIME_PLANNER__H__
+
+#include <glib.h>
+#include <glib-object.h> /* parent class */
+#include <gdk/gdk.h> /* GdkRGBA */
+
+G_BEGIN_DECLS
+
+#define INDICATOR_TYPE_DATETIME_PLANNER          (indicator_datetime_planner_get_type())
+#define INDICATOR_DATETIME_PLANNER(o)            (G_TYPE_CHECK_INSTANCE_CAST ((o), INDICATOR_TYPE_DATETIME_PLANNER, IndicatorDatetimePlanner))
+#define INDICATOR_DATETIME_PLANNER_GET_CLASS(o)  (G_TYPE_INSTANCE_GET_CLASS ((o), INDICATOR_TYPE_DATETIME_PLANNER, IndicatorDatetimePlannerClass))
+#define INDICATOR_DATETIME_PLANNER_CLASS(k)      (G_TYPE_CHECK_CLASS_CAST ((k), INDICATOR_TYPE_DATETIME_PLANNER, IndicatorDatetimePlannerClass))
+#define INDICATOR_IS_DATETIME_PLANNER(o)         (G_TYPE_CHECK_INSTANCE_TYPE ((o), INDICATOR_TYPE_DATETIME_PLANNER))
+
+typedef struct _IndicatorDatetimePlanner        IndicatorDatetimePlanner;
+typedef struct _IndicatorDatetimePlannerPriv    IndicatorDatetimePlannerPriv;
+typedef struct _IndicatorDatetimePlannerClass   IndicatorDatetimePlannerClass;
+
+GType indicator_datetime_planner_get_type (void);
+
+struct IndicatorDatetimeAppt
+{
+  char * color;
+  char * summary;
+  GDateTime * begin;
+  GDateTime * end;
+  gboolean is_event;
+};
+
+/**
+ * Abstract Base Class for objects that provides appointments and events.
+ *
+ * These will be listed in the appointments section of indicator-datetime's menu.
+ */
+struct _IndicatorDatetimePlanner
+{
+  /*< private >*/
+  GObject parent;
+  IndicatorDatetimePlannerPriv * priv;
+};
+
+struct _IndicatorDatetimePlannerClass
+{
+  GObjectClass parent_class;
+
+  /* signals */
+
+  void (*appointments_changed)  (IndicatorDatetimePlanner * self);
+
+  /* virtual functions */
+
+  GSList* (*get_appointments)   (IndicatorDatetimePlanner * self, GDateTime * begin, GDateTime * end);
+
+  gboolean (*is_configured)     (IndicatorDatetimePlanner * self);
+  void (*activate)              (IndicatorDatetimePlanner * self);
+  void (*activate_time)         (IndicatorDatetimePlanner * self, GDateTime *);
+};
+
+/***
+****
+***/
+
+void indicator_datetime_appt_free (struct IndicatorDatetimeAppt * appt);
+
+/**
+ * Get a list of appointments, sorted by start time.
+ *
+ * An easy way to free the list properly in one step is as follows:
+ *
+ *   g_slist_free_full (list, (GDestroyNotify)indicator_datetime_appt_free);
+ *
+ * 
+ * Return value: (element-type IndicatorDatetimeAppt)
+ *               (transfer full):
+ *               list of appointments
+ */
+GSList * indicator_datetime_planner_get_appointments (IndicatorDatetimePlanner * self, GDateTime * begin, GDateTime * end);
+
+/**
+ * Returns false if the planner's backend is not configured.
+ *
+ * This can be used on startup to determine whether or not to use this planner.
+ */
+gboolean indicator_datetime_planner_is_configured (IndicatorDatetimePlanner * self);
+
+/**
+ * Activate this planner.
+ *
+ * This is used to activate the planner's backend's event editor.
+ */
+void indicator_datetime_planner_activate (IndicatorDatetimePlanner * self);
+
+/**
+ * Activate this planner.
+ *
+ * This is used to activate the planner's backend's event editor,
+ * with an added hint of the specific time that the user would like to edit.
+ */
+void indicator_datetime_planner_activate_time (IndicatorDatetimePlanner * self, GDateTime * time);
+
+/**
+ * Set the timezone.
+ *
+ * This is used as a default timezone if the backend's events don't provide their own.
+ */
+void indicator_datetime_planner_set_timezone (IndicatorDatetimePlanner * self, const char * timezone);
+
+const char * indicator_datetime_planner_get_timezone (IndicatorDatetimePlanner * self);
+
+
+/**
+ * Emits the "appointments-changed" signal. This should only be called by subclasses.
+ */
+void indicator_datetime_planner_emit_appointments_changed (IndicatorDatetimePlanner * self);
+
+G_END_DECLS
+
+#endif /* __INDICATOR_DATETIME_PLANNER__H__ */