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diff --git a/lib/dns/rdata/in_1/apl_42.h b/lib/dns/rdata/in_1/apl_42.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/* */
+#ifndef IN_1_APL_42_H
+#define IN_1_APL_42_H 1
+
+
+typedef struct dns_rdata_apl_ent {
+ bool negative;
+ uint16_t family;
+ uint8_t prefix;
+ uint8_t length;
+ unsigned char *data;
+} dns_rdata_apl_ent_t;
+
+typedef struct dns_rdata_in_apl {
+ dns_rdatacommon_t common;
+ isc_mem_t *mctx;
+ /* type & class specific elements */
+ unsigned char *apl;
+ uint16_t apl_len;
+ /* private */
+ uint16_t offset;
+} dns_rdata_in_apl_t;
+
+/*
+ * ISC_LANG_BEGINDECLS and ISC_LANG_ENDDECLS are already done
+ * via rdatastructpre.h and rdatastructsuf.h.
+ */
+
+isc_result_t
+dns_rdata_apl_first(dns_rdata_in_apl_t *);
+
+isc_result_t
+dns_rdata_apl_next(dns_rdata_in_apl_t *);
+
+isc_result_t
+dns_rdata_apl_current(dns_rdata_in_apl_t *, dns_rdata_apl_ent_t *);
+
+unsigned int
+dns_rdata_apl_count(const dns_rdata_in_apl_t *apl);
+
+#endif /* IN_1_APL_42_H */