diff --git a/apps/cli/cli_common.c b/apps/cli/cli_common.c
index 1b4b781a..e0d1500c 100644
--- a/apps/cli/cli_common.c
+++ b/apps/cli/cli_common.c
@@ -733,82 +733,6 @@ cli_validate(clicon_handle h,
     return retval;
 }
 
-/*! Compare two dbs using XML. Write to file and run diff
- */
-static int
-compare_xmls(cxobj           *xc1,
-             cxobj           *xc2,
-             enum format_enum format)
-{
-    int    fd;
-    FILE  *f;
-    char   filename1[MAXPATHLEN];
-    char   filename2[MAXPATHLEN];
-    int    retval = -1;
-    cbuf  *cb = NULL;
-
-    snprintf(filename1, sizeof(filename1), "/tmp/cliconXXXXXX");
-    snprintf(filename2, sizeof(filename2), "/tmp/cliconXXXXXX");
-    if ((fd = mkstemp(filename1)) < 0){
-        clicon_err(OE_UNDEF, errno, "tmpfile");
-        goto done;
-    }
-    if ((f = fdopen(fd, "w")) == NULL)
-        goto done;
-    switch(format){
-    case FORMAT_TEXT:
-        if (clixon_txt2file(f, xc1, 0, cligen_output, 1, 1) < 0)
-            goto done;
-        break;
-    case FORMAT_XML:
-    default:
-        if (clixon_xml2file(f, xc1, 0, 1, cligen_output, 1, 1) < 0)
-            goto done;
-        break;
-    }
-    fclose(f);
-    close(fd);
-
-    if ((fd = mkstemp(filename2)) < 0){
-        clicon_err(OE_UNDEF, errno, "mkstemp: %s", strerror(errno));
-        goto done;
-    }
-    if ((f = fdopen(fd, "w")) == NULL)
-        goto done;
-
-    switch(format){
-    case FORMAT_TEXT:
-        if (clixon_txt2file(f, xc2, 0, cligen_output, 1, 1) < 0)
-            goto done;
-        break;
-    case FORMAT_XML:
-    default:
-        if (clixon_xml2file(f, xc2, 0, 1, cligen_output, 1, 1) < 0)
-            goto done;
-        break;
-    }
-
-    fclose(f);
-    close(fd);
-
-    if ((cb = cbuf_new()) == NULL){
-        clicon_err(OE_CFG, errno, "cbuf_new");
-        goto done;
-    }
-    cprintf(cb, "diff -dU 1 %s %s |  grep -v @@ | sed 1,2d",
-            filename1, filename2);
-    if (system(cbuf_get(cb)) < 0)
-        goto done;
-
-    retval = 0;
-  done:
-    if (cb)
-        cbuf_free(cb);
-    unlink(filename1);
-    unlink(filename2);
-    return retval;
-}
-
 /*! Compare two dbs using XML. Write to file and run diff
  * @param[in]   h     Clicon handle
  * @param[in]   cvv  
@@ -845,7 +769,7 @@ compare_dbs(clicon_handle h,
         clixon_netconf_error(xerr, "Get configuration", NULL);
         goto done;
     }
-    if (compare_xmls(xc1, xc2, format) < 0) /* astext? */
+    if (clixon_compare_xmls(xc1, xc2, format, cligen_output) < 0) /* astext? */
         goto done;
     retval = 0;
   done:
diff --git a/lib/clixon/clixon_proto.h b/lib/clixon/clixon_proto.h
index 74f92f40..076b6021 100644
--- a/lib/clixon/clixon_proto.h
+++ b/lib/clixon/clixon_proto.h
@@ -43,13 +43,6 @@
 /*
  * Types
  */
-enum format_enum{
-    FORMAT_XML,  
-    FORMAT_JSON,  
-    FORMAT_TEXT,  
-    FORMAT_CLI,
-    FORMAT_NETCONF
-};
 
 /* Protocol message header */
 struct clicon_msg {
diff --git a/lib/clixon/clixon_xml.h b/lib/clixon/clixon_xml.h
index d70e2a02..a44060c8 100644
--- a/lib/clixon/clixon_xml.h
+++ b/lib/clixon/clixon_xml.h
@@ -177,6 +177,15 @@ typedef int (xml_applyfn_t)(cxobj *x, void *arg);
 
 typedef struct clixon_xml_vec clixon_xvec; /* struct defined in clicon_xml_vec.c */
 
+/* Alternative formats */
+enum format_enum{
+    FORMAT_XML,  
+    FORMAT_JSON,  
+    FORMAT_TEXT,  
+    FORMAT_CLI,
+    FORMAT_NETCONF
+};
+
 /*
  * xml_flag() flags:
  */
diff --git a/lib/clixon/clixon_xml_map.h b/lib/clixon/clixon_xml_map.h
index af6b3dbb..6beda9ce 100644
--- a/lib/clixon/clixon_xml_map.h
+++ b/lib/clixon/clixon_xml_map.h
@@ -75,5 +75,6 @@ int yang_xml_mandatory(cxobj *xt, yang_stmt *ys);
 int xml_rpc_isaction(cxobj *xn);
 int xml_find_action(cxobj *xn, int top, cxobj **xap);
 int purge_tagged_nodes(cxobj *xn, char *ns, char *name, char *value, int keepnode);
+int clixon_compare_xmls(cxobj *xc1, cxobj *xc2, enum format_enum format, clicon_output_cb *fn);
 
 #endif  /* _CLIXON_XML_MAP_H_ */
diff --git a/lib/src/clixon_validate.c b/lib/src/clixon_validate.c
index 6dd21830..1af42b14 100644
--- a/lib/src/clixon_validate.c
+++ b/lib/src/clixon_validate.c
@@ -1101,7 +1101,7 @@ xml_yang_validate_list_key_only(cxobj        *xt,
     int        ret;
     cxobj     *x;
     
-    /* if not given by argument (overide) use default link 
+    /* if not given by argument (override) use default link 
        and !Node has a config sub-statement and it is false */
     if ((yt = xml_spec(xt)) != NULL &&
         yang_config(yt) != 0 &&
@@ -1229,8 +1229,8 @@ xml_yang_validate_all(clicon_handle h,
     /* Do not validate beyond mountpoints */
     if ((ret = xml_yang_mount_get(xt, NULL)) < 0)
         goto done;
-    if (ret == 1)
-        goto ok;
+    if (ret == 1) 
+        goto ok; /* Actually this may be somewhat too strict */
 #endif
     /* if not given by argument (overide) use default link 
        and !Node has a config sub-statement and it is false */
diff --git a/lib/src/clixon_xml_map.c b/lib/src/clixon_xml_map.c
index 58b620dd..f2f9f1ab 100644
--- a/lib/src/clixon_xml_map.c
+++ b/lib/src/clixon_xml_map.c
@@ -77,6 +77,8 @@
 #include "clixon_netconf_lib.h"
 #include "clixon_xml_sort.h"
 #include "clixon_yang_type.h"
+#include "clixon_text_syntax.h"
+#include "clixon_xml_io.h"
 #include "clixon_xml_map.h"
 
 /* Local types 
@@ -1703,3 +1705,84 @@ purge_tagged_nodes(cxobj *xn,
     return retval;
 }
 
+/*! Compare two dbs using XML. Write to file and run diff
+ *
+ * @param[in]  xc1     XML tree 1
+ * @param[in]  xc2     XML tree 2
+ * @param[in]  format  "text"|"xml"|"json"|"cli"|"netconf" (see format_enum)
+ * @param[in]  fn      File print function (if NULL, use fprintf)
+ */
+int
+clixon_compare_xmls(cxobj            *xc1,
+                    cxobj            *xc2,
+                    enum format_enum  format,
+                    clicon_output_cb *fn)
+{
+    int    fd;
+    FILE  *f;
+    char   filename1[MAXPATHLEN];
+    char   filename2[MAXPATHLEN];
+    int    retval = -1;
+    cbuf  *cb = NULL;
+
+    snprintf(filename1, sizeof(filename1), "/tmp/cliconXXXXXX");
+    snprintf(filename2, sizeof(filename2), "/tmp/cliconXXXXXX");
+    if ((fd = mkstemp(filename1)) < 0){
+        clicon_err(OE_UNDEF, errno, "tmpfile");
+        goto done;
+    }
+    if ((f = fdopen(fd, "w")) == NULL)
+        goto done;
+    switch(format){
+    case FORMAT_TEXT:
+        if (clixon_txt2file(f, xc1, 0, cligen_output, 1, 1) < 0)
+            goto done;
+        break;
+    case FORMAT_XML:
+    default:
+        if (clixon_xml2file(f, xc1, 0, 1, cligen_output, 1, 1) < 0)
+            goto done;
+        break;
+    }
+    fclose(f);
+    close(fd);
+
+    if ((fd = mkstemp(filename2)) < 0){
+        clicon_err(OE_UNDEF, errno, "mkstemp: %s", strerror(errno));
+        goto done;
+    }
+    if ((f = fdopen(fd, "w")) == NULL)
+        goto done;
+
+    switch(format){
+    case FORMAT_TEXT:
+        if (clixon_txt2file(f, xc2, 0, cligen_output, 1, 1) < 0)
+            goto done;
+        break;
+    case FORMAT_XML:
+    default:
+        if (clixon_xml2file(f, xc2, 0, 1, cligen_output, 1, 1) < 0)
+            goto done;
+        break;
+    }
+
+    fclose(f);
+    close(fd);
+
+    if ((cb = cbuf_new()) == NULL){
+        clicon_err(OE_CFG, errno, "cbuf_new");
+        goto done;
+    }
+    cprintf(cb, "diff -dU 1 %s %s |  grep -v @@ | sed 1,2d",
+            filename1, filename2);
+    if (system(cbuf_get(cb)) < 0)
+        goto done;
+
+    retval = 0;
+  done:
+    if (cb)
+        cbuf_free(cb);
+    unlink(filename1);
+    unlink(filename2);
+    return retval;
+}
diff --git a/lib/src/clixon_yang_schema_mount.c b/lib/src/clixon_yang_schema_mount.c
index adb1b09e..0f2ecad0 100644
--- a/lib/src/clixon_yang_schema_mount.c
+++ b/lib/src/clixon_yang_schema_mount.c
@@ -162,6 +162,7 @@ xml_yang_mount_get(cxobj      *xt,
         goto ok;
     if (xml2xpath(xt, NULL, 1, &xpath) < 0)
         goto done;
+    /* Special value in yang unknown node for mount-points: mapping from xpath->mounted yspec */
     if ((cvv = yang_cvec_get(yu)) == NULL)
         goto ok;
     if ((cv = cvec_find(cvv, xpath)) == NULL)
diff --git a/test/test_netconf.sh b/test/test_netconf.sh
index dc4de610..8687961b 100755
--- a/test/test_netconf.sh
+++ b/test/test_netconf.sh
@@ -62,6 +62,9 @@ module clixon-example{
             leaf name{
                 type string;
             }
+            leaf value{
+                type string;
+            }
         }
     }
    /* State data (not config) for the example application*/
@@ -223,7 +226,7 @@ new "Re-Delete eth/0/0 using none should generate error"
 expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><interfaces xmlns=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\" xmlns:nc=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><interface nc:operation=\"delete\"><name>eth/0/0</name><type>ex:eth</type></interface></interfaces></config><default-operation>none</default-operation> </edit-config></rpc>" "<rpc-reply $DEFAULTNS><rpc-error>" ""
 
 new "Add interface without key"
-expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><interfaces xmlns=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\" xmlns:nc=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><interface nc:operation=\"create\"><type>ex:eth</type></interface></interfaces></config><default-operation>none</default-operation> </edit-config></rpc>" "" "<rpc-reply $DEFAULTNS><rpc-error><error-type>application</error-type><error-tag>missing-element</error-tag><error-info><bad-element>name</bad-element></error-info><error-severity>error</error-severity><error-message>Mandatory key in 'list interface' in ietf-interfaces.yang:107</error-message></rpc-error></rpc-reply>"
+expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><interfaces xmlns=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\" xmlns:nc=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><interface nc:operation=\"create\"><type>ex:eth</type></interface></interfaces></config><default-operation>none</default-operation> </edit-config></rpc>" "<rpc-reply $DEFAULTNS><rpc-error><error-type>application</error-type><error-tag>missing-element</error-tag><error-info><bad-element>name</bad-element></error-info><error-severity>error</error-severity><error-message>Mandatory key in 'list interface' in ietf-interfaces.yang:[0-9]\+</error-message></rpc-error></rpc-reply>" ""
 
 new "netconf discard-changes"
 expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><discard-changes/></rpc>" "" "<rpc-reply $DEFAULTNS><ok/></rpc-reply>"
@@ -430,10 +433,22 @@ expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS>
 new "netconf client-side rpc"
 expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><client-rpc xmlns=\"urn:example:clixon\"><x>val42</x></client-rpc></rpc>" "" "<rpc-reply $DEFAULTNS><x xmlns=\"urn:example:clixon\">val42</x></rpc-reply>"
 
+# Negative tests
 new "netconf extra leaf in leaf should fail"
 expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><interfaces xmlns=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\"><interface><name>e0<name>e1</name></name></interface></interfaces></config></edit-config></rpc>" "" "<rpc-reply $DEFAULTNS><rpc-error><error-type>application</error-type><error-tag>unknown-element</error-tag><error-info><bad-element>name</bad-element></error-info><error-severity>error</error-severity><error-message>Failed to find YANG spec of XML node: name with parent: name in namespace: urn:ietf:params:xml:ns:yang:ietf-interfaces</error-message></rpc-error></rpc-reply>"
 
-# Negative tests
+new "netconf duplicate keys"
+expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><table xmlns=\"urn:example:clixon\"><parameter><name>xx</name><name>yy</name></parameter></table></config></edit-config></rpc>" "" "<rpc-reply $DEFAULTNS><ok/></rpc-reply>"
+
+new "netconf validate duplicate keys expect fail"
+expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><validate><source><candidate/></source></validate></rpc>" "<rpc-reply $DEFAULTNS><rpc-error><error-type>protocol</error-type><error-tag>operation-failed</error-tag><error-app-tag>too-many-elements</error-app-tag>" ""
+
+new "netconf duplicate values"
+expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><edit-config><target><candidate/></target><config><table xmlns=\"urn:example:clixon\"><parameter><name>xx</name><value>foo</value><value>bar</value></parameter></table></config></edit-config></rpc>" "" "<rpc-reply $DEFAULTNS><ok/></rpc-reply>"
+
+new "netconf validate duplicate values expect fail"
+expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><validate><source><candidate/></source></validate></rpc>" "<rpc-reply $DEFAULTNS><rpc-error><error-type>protocol</error-type><error-tag>operation-failed</error-tag><error-app-tag>too-many-elements</error-app-tag>" ""
+
 new "netconf xpath syntax error (api-path not xpath) should fail"
 expecteof_netconf "$clixon_netconf -qf $cfg" 0 "$DEFAULTHELLO" "<rpc $DEFAULTNS><get-config><source><candidate/></source><filter type=\"xpath\" select=\"/if:interfaces/interface=eth2f0,foo/fii\" xmlns:if=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\"/></get-config></rpc>" "" "<rpc-reply $DEFAULTNS><rpc-error><error-type>application</error-type><error-tag>operation-failed</error-tag><error-severity>error</error-severity><error-message>xpath parser on line 1: syntax error at or before: ','</error-message></rpc-error></rpc-reply>"