--- /dev/null
+/* See the DRL-LICENSE file for this file's software license. */
+
+#ifndef _CALENDAR_H_
+#define _CALENDAR_H_
+
+#include "bsd_queue.h"
+#include "ratetypes.h"
+
+#define SCHEDBITS (7)
+#define SCHEDLEN (1 << SCHEDBITS)
+#define SCHEDMASK (SCHEDLEN - 1)
+
+/** Defines a struct ident_calendar whose elements are of type struct identity
+ * (identity_t) */
+TAILQ_HEAD(ident_calendar, identity);
+
+
+#endif /* _CALENDAR_H_ */