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diff --git a/bin/named/include/named/zoneconf.h b/bin/named/include/named/zoneconf.h
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+++ b/bin/named/include/named/zoneconf.h
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+/*
+ * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1999-2002  Internet Software Consortium.
+ *
+ * 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: zoneconf.h,v 1.26 2007/06/19 23:46:59 tbox Exp $ */
+
+#ifndef NS_ZONECONF_H
+#define NS_ZONECONF_H 1
+
+/*! \file */
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+#include <isccfg/aclconf.h>
+#include <isccfg/cfg.h>
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+ns_zone_configure(const cfg_obj_t *config, const cfg_obj_t *vconfig,
+		  const cfg_obj_t *zconfig, cfg_aclconfctx_t *ac,
+		  dns_zone_t *zone);
+/*%<
+ * Configure or reconfigure a zone according to the named.conf
+ * data in 'cctx' and 'czone'.
+ *
+ * The zone origin is not configured, it is assumed to have been set
+ * at zone creation time.
+ *
+ * Require:
+ * \li	'lctx' to be initialized or NULL.
+ * \li	'cctx' to be initialized or NULL.
+ * \li	'ac' to point to an initialized ns_aclconfctx_t.
+ * \li	'czone' to be initialized.
+ * \li	'zone' to be initialized.
+ */
+
+isc_boolean_t
+ns_zone_reusable(dns_zone_t *zone, const cfg_obj_t *zconfig);
+/*%<
+ * If 'zone' can be safely reconfigured according to the configuration
+ * data in 'zconfig', return ISC_TRUE.  If the configuration data is so
+ * different from the current zone state that the zone needs to be destroyed
+ * and recreated, return ISC_FALSE.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* NS_ZONECONF_H */