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diff --git a/lib/dns/include/dns/private.h b/lib/dns/include/dns/private.h
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+/*
+ * Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: private.h,v 1.3 2009-10-09 23:48:09 tbox Exp $ */
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+#include <dns/types.h>
+#include <dns/db.h>
+
+#ifndef DNS_PRIVATE_H
+#define DNS_PRIVATE_H
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+dns_private_chains(dns_db_t *db, dns_dbversion_t *ver,
+ dns_rdatatype_t privatetype,
+ isc_boolean_t *build_nsec, isc_boolean_t *build_nsec3);
+/*%<
+ * Examine the NSEC, NSEC3PARAM and privatetype RRsets at the apex of the
+ * database to determine which of NSEC or NSEC3 chains we are currently
+ * maintaining. In normal operations only one of NSEC or NSEC3 is being
+ * maintained but when we are transitiong between NSEC and NSEC3 we need
+ * to update both sets of chains. If 'privatetype' is zero then the
+ * privatetype RRset will not be examined.
+ *
+ * Requires:
+ * \li 'db' is valid.
+ * \li 'version' is valid or NULL.
+ * \li 'build_nsec' is a pointer to a isc_boolean_t or NULL.
+ * \li 'build_nsec3' is a pointer to a isc_boolean_t or NULL.
+ *
+ * Returns:
+ * \li ISC_R_SUCCESS, 'build_nsec' and 'build_nsec3' will be valid.
+ * \li other on error
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif