diff --git a/CHANGES b/CHANGES
index cc89d1101f..739f27091f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+ 585.	[func]		dns_db_addrdataset() and and dns_rdataslab_merge()
+			now support 'exact' additions in a similar manner to
+			dns_db_subtractrdataset() and dns_rdataslab_subtract().
 
  584.	[func]		You can now say 'notify explicit'; to suppress
 			notification of the servers listed in NS records
@@ -170,10 +173,10 @@
  526.	[bug]		nsupdate incorrectly refused to add RRs with a TTL
 			of 0.
 
- 525.	[func]		New argument 'exact' for dns_db_subtractrdataset(),
-			and dns_rdataslab_subtract() requesting that the RR's
-			must exist prior to deletion.  DNS_R_NOTEXACT is
-			returned if the condition is not met.
+ 525.	[func]		New arguments 'options' for dns_db_subtractrdataset(),
+			and 'flags' for dns_rdataslab_subtract() allowing you
+			to request that the RR's must exist prior to deletion.
+			DNS_R_NOTEXACT is returned if the condition is not met.
 
  524.	[func]		The 'forward' and 'forwarders' statement in
 			non-forward zones should work now.
diff --git a/lib/dns/db.c b/lib/dns/db.c
index deeeb41ac5..3389f74c1d 100644
--- a/lib/dns/db.c
+++ b/lib/dns/db.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: db.c,v 1.64 2000/11/30 13:19:04 marka Exp $ */
+/* $Id: db.c,v 1.65 2000/12/01 01:22:38 marka Exp $ */
 
 /***
  *** Imports
@@ -631,7 +631,7 @@ dns_db_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 isc_result_t
 dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
 			dns_dbversion_t *version, dns_rdataset_t *rdataset,
-			isc_boolean_t exact, dns_rdataset_t *newrdataset)
+			unsigned int options, dns_rdataset_t *newrdataset)
 {
 	/*
 	 * Remove any rdata in 'rdataset' from 'node' in version 'version' of
@@ -649,7 +649,7 @@ dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
 		 ! dns_rdataset_isassociated(newrdataset)));
 
 	return ((db->methods->subtractrdataset)(db, node, version, rdataset,
-						exact, newrdataset));
+						options, newrdataset));
 }
 
 isc_result_t
diff --git a/lib/dns/include/dns/db.h b/lib/dns/include/dns/db.h
index 7ee53679d5..11efccabcd 100644
--- a/lib/dns/include/dns/db.h
+++ b/lib/dns/include/dns/db.h
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: db.h,v 1.61 2000/11/30 13:19:08 marka Exp $ */
+/* $Id: db.h,v 1.62 2000/12/01 01:22:44 marka Exp $ */
 
 #ifndef DNS_DB_H
 #define DNS_DB_H 1
@@ -134,7 +134,7 @@ typedef struct dns_dbmethods {
 	isc_result_t	(*subtractrdataset)(dns_db_t *db, dns_dbnode_t *node,
 					    dns_dbversion_t *version,
 					    dns_rdataset_t *rdataset,
-					    isc_boolean_t exact,
+					    unsigned int options,
 					    dns_rdataset_t *newrdataset);
 	isc_result_t	(*deleterdataset)(dns_db_t *db, dns_dbnode_t *node,
 					  dns_dbversion_t *version,
@@ -194,6 +194,11 @@ struct dns_db {
 #define DNS_DBADD_FORCE			0x02
 #define DNS_DBADD_EXACT			0x04
 
+/*
+ * Options that can be specified for dns_db_subtractrdataset().
+ */
+#define DNS_DBSUB_EXACT			0x01
+
 /*****
  ***** Methods
  *****/
@@ -1049,6 +1054,7 @@ dns_db_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
  *	ISC_R_SUCCESS
  *	DNS_R_UNCHANGED			The operation did not change anything.
  *	ISC_R_NOMEMORY
+ *	DNS_R_NOTEXACT
  *
  *	Other results are possible, depending upon the database
  *	implementation used.
@@ -1057,7 +1063,7 @@ dns_db_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 isc_result_t
 dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
 			dns_dbversion_t *version, dns_rdataset_t *rdataset,
-			isc_boolean_t exact, dns_rdataset_t *newrdataset);
+			unsigned int options, dns_rdataset_t *newrdataset);
 /*
  * Remove any rdata in 'rdataset' from 'node' in version 'version' of
  * 'db'.
@@ -1066,7 +1072,8 @@ dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
  *
  *	If 'newrdataset' is not NULL, then it will be attached to the
  *	resulting new rdataset in the database, unless the rdataset has
- *	become nonexistent.
+ *	become nonexistent.  If DNS_DBSUB_EXACT is set then all elements
+ *	of 'rdataset' must exist at 'node'.
  *
  * Requires:
  *
@@ -1077,9 +1084,6 @@ dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
  *	'rdataset' is a valid, associated rdataset with the same class
  *	as 'db'.
  *
- *	'exact' if ISC_TRUE then all rdata in 'rdataset' must exist
- *	at 'node'.
- *
  *	'newrdataset' is NULL, or a valid, unassociated rdataset.
  *
  *	The database has zone semantics and 'version' is a valid
@@ -1092,7 +1096,7 @@ dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
  *	DNS_R_NXRRSET			All rdata of the same type as those
  *					in 'rdataset' have been deleted.
  *	DNS_R_NOTEXACT			Some part of 'rdataset' did not
- *					exist and 'exact' was ISC_TRUE.
+ *					exist and DNS_DBSUB_EXACT was set.
  *
  *	Other results are possible, depending upon the database
  *	implementation used.
diff --git a/lib/dns/include/dns/rdataslab.h b/lib/dns/include/dns/rdataslab.h
index 77d7c077bd..d7ba310a37 100644
--- a/lib/dns/include/dns/rdataslab.h
+++ b/lib/dns/include/dns/rdataslab.h
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdataslab.h,v 1.17 2000/11/30 13:19:09 marka Exp $ */
+/* $Id: rdataslab.h,v 1.18 2000/12/01 01:22:45 marka Exp $ */
 
 #ifndef DNS_RDATASLAB_H
 #define DNS_RDATASLAB_H 1
@@ -103,7 +103,6 @@ dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
 /*
  * Merge 'oslab' and 'nslab'.
  *
- * XXX
  * DNS_RDATASLAB_FORCE and DNS_RDATASLAB_EXACT are mutually exclusive.
  */
 
@@ -111,12 +110,13 @@ isc_result_t
 dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
 		       unsigned int reservelen, isc_mem_t *mctx,
 		       dns_rdataclass_t rdclass, dns_rdatatype_t type,
-		       isc_boolean_t exact, unsigned char **tslabp);
+		       unsigned int flags, unsigned char **tslabp);
 /*
  * Subtract 'sslab' from 'mslab'.  If 'exact' is true then all elements
  * of 'sslab' must exist in 'mslab'.
  *
  * XXX
+ * valid flags are DNS_RDATASLAB_EXACT
  */
 
 isc_boolean_t
diff --git a/lib/dns/journal.c b/lib/dns/journal.c
index b2a1937d61..e97f38e13c 100644
--- a/lib/dns/journal.c
+++ b/lib/dns/journal.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: journal.c,v 1.64 2000/11/30 13:19:05 marka Exp $ */
+/* $Id: journal.c,v 1.65 2000/12/01 01:22:39 marka Exp $ */
 
 #include <config.h>
 
@@ -403,7 +403,7 @@ dns_diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver)
 			} else if (op == DNS_DIFFOP_DEL) {
 				result = dns_db_subtractrdataset(db, node, ver,
 								 &rds,
-								 ISC_TRUE,
+							        DNS_DBSUB_EXACT,
 								 NULL);
 			} else {
 				INSIST(0);
diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
index a94371913e..01bc4129b2 100644
--- a/lib/dns/rbtdb.c
+++ b/lib/dns/rbtdb.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rbtdb.c,v 1.135 2000/11/30 13:19:06 marka Exp $ */
+/* $Id: rbtdb.c,v 1.136 2000/12/01 01:22:41 marka Exp $ */
 
 /*
  * Principal Author: Bob Halley
@@ -3472,7 +3472,7 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 
 static isc_result_t
 subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
-		 dns_rdataset_t *rdataset, isc_boolean_t exact,
+		 dns_rdataset_t *rdataset, unsigned int options,
 		 dns_rdataset_t *newrdataset)
 {
 	dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
@@ -3524,7 +3524,10 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 	while (header != NULL && IGNORE(header))
 		header = header->down;
 	if (header != NULL && EXISTS(header)) {
+		unsigned int flags = 0;
 		subresult = NULL;
+		if ((options & DNS_DBSUB_EXACT) != 0)
+			flags |= DNS_RDATASLAB_EXACT;
 		result = dns_rdataslab_subtract(
 					(unsigned char *)header,
 					(unsigned char *)newheader,
@@ -3532,7 +3535,7 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 					rbtdb->common.mctx,
 					rbtdb->common.rdclass,
 					(dns_rdatatype_t)header->type,
-					exact, &subresult);
+					flags, &subresult);
 		if (result == ISC_R_SUCCESS) {
 			free_rdataset(rbtdb->common.mctx, newheader);
 			newheader = (rdatasetheader_t *)subresult;
diff --git a/lib/dns/rdataslab.c b/lib/dns/rdataslab.c
index 16316db902..fa69ce1487 100644
--- a/lib/dns/rdataslab.c
+++ b/lib/dns/rdataslab.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdataslab.c,v 1.26 2000/11/30 23:59:08 marka Exp $ */
+/* $Id: rdataslab.c,v 1.27 2000/12/01 01:22:42 marka Exp $ */
 
 #include <config.h>
 
@@ -302,8 +302,8 @@ dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
 	} while (ncount > 0);
 	ncount = nncount;
 
-	if ((flags & DNS_RDATASLAB_EXACT) != 0 &&
-	    tcount != ncount + ocount)
+	if (((flags & DNS_RDATASLAB_EXACT) != 0) &&
+	    (tcount != ncount + ocount))
 		return (DNS_R_NOTEXACT);
 
 	if (!added_something && (flags & DNS_RDATASLAB_FORCE) == 0)
@@ -401,7 +401,7 @@ isc_result_t
 dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
 		       unsigned int reservelen, isc_mem_t *mctx,
 		       dns_rdataclass_t rdclass, dns_rdatatype_t type,
-		       isc_boolean_t exact, unsigned char **tslabp)
+		       unsigned int flags, unsigned char **tslabp)
 {
 	unsigned char *mcurrent, *sstart, *scurrent, *tstart, *tcurrent;
 	unsigned int mcount, scount, rcount ,count, tlength, tcount;
@@ -462,7 +462,7 @@ dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
 	 * Check that all the records originally existed.  The numeric
  	 * check only works as rdataslabs do not contain duplicates.
 	 */
-	if (exact && (rcount != scount))
+	if (((flags & DNS_RDATASLAB_EXACT) != 0) && (rcount != scount))
 		return (DNS_R_NOTEXACT);
 
 	/*
diff --git a/lib/dns/sdb.c b/lib/dns/sdb.c
index 8c33215e60..9792980740 100644
--- a/lib/dns/sdb.c
+++ b/lib/dns/sdb.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: sdb.c,v 1.19 2000/12/01 01:00:47 gson Exp $ */
+/* $Id: sdb.c,v 1.20 2000/12/01 01:22:43 marka Exp $ */
 
 #include <config.h>
 
@@ -1033,14 +1033,14 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
 
 static isc_result_t
 subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
-		 dns_rdataset_t *rdataset, isc_boolean_t exact,
+		 dns_rdataset_t *rdataset, unsigned int options,
 		 dns_rdataset_t *newrdataset)
 {
 	UNUSED(db);
 	UNUSED(node);
 	UNUSED(version);
 	UNUSED(rdataset);
-	UNUSED(exact);
+	UNUSED(options);
 	UNUSED(newrdataset);
 
 	return (ISC_R_NOTIMPLEMENTED);