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diff --git a/lib/dns/rbtdb.h b/lib/dns/rbtdb.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#ifndef DNS_RBTDB_H
+#define DNS_RBTDB_H 1
+
+#include <isc/lang.h>
+
+#include <dns/types.h>
+
+/*****
+***** Module Info
+*****/
+
+/*! \file
+ * \brief
+ * DNS Red-Black Tree DB Implementation
+ */
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+dns_rbtdb_create(isc_mem_t *mctx, const dns_name_t *base, dns_dbtype_t type,
+		 dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
+		 void *driverarg, dns_db_t **dbp);
+
+/*%<
+ * Create a new database of type "rbt" (or "rbt64").  Called via
+ * dns_db_create(); see documentation for that function for more details.
+ *
+ * If argv[0] is set, it points to a valid memory context to be used for
+ * allocation of heap memory.  Generally this is used for cache databases
+ * only.
+ *
+ * Requires:
+ *
+ * \li argc == 0 or argv[0] is a valid memory context.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* DNS_RBTDB_H */