diff --git a/models/rpc.lua b/models/rpc.lua
index d3158e6..a7af48b 100644
--- a/models/rpc.lua
+++ b/models/rpc.lua
@@ -59,16 +59,56 @@ local function get_reset_history()
     return { ["last-reset"] = lasttime, ["history"] = history }
 end
 
-local function set_age(input, path)
-    local user = path:match('/t4:test/state/users/([^/]+)')
-    local age = input["age"]
-    apteryx.set("/t4:test/state/users/" .. user .. "/age", age)
+local function createget_users(input, _, method)
+    if method == "GET" then
+        local users = {}
+        for _, info in pairs(apteryx.get_tree('/t4:test/state/users')) do
+            users[#users + 1] = {
+                ["name"] = info["name"],
+                ["age"] = info["age"],
+            }
+        end
+        return {
+            ["users"] = users,
+        }
+    elseif method == "POST" then
+        if input["name"] == nil or input["age"] == nil then
+            return false
+        end
+        apteryx.set_tree ("/t4:test/state/users/" .. input["name"], {
+            ["name"] = input["name"],
+            ["age"] = input["age"],
+        })
+    end
     return true
 end
 
-local function delete_user(input, path)
+local function modifydelete_user(input, path, method)
     local user = path:match('/t4:test/state/users/([^/]+)')
-    apteryx.prune("/t4:test/state/users/" .. user)
+    if user == nil then
+        return false
+    end
+    if method == "PUT" then
+        if input["age"] == nil or apteryx.get("/t4:test/state/users/" .. user .. '/name') ~= user then
+            return false
+        end
+        apteryx.set_tree("/t4:test/state/users/" .. user, {
+            ["age"]  = input["age"],
+        })
+        return true
+    elseif method == "DELETE" then
+        apteryx.prune("/t4:test/state/users/" .. user)
+        return true
+    end
+    return false
+end
+
+local function set_user_age(input, path)
+    local user = path:match('/t4:test/state/users/([^/]+)')
+    if user == nil then
+        return false
+    end
+    apteryx.set("/t4:test/state/users/" .. user .. "/age", input["age"])
     return true
 end
 
@@ -79,6 +119,7 @@ return {
     { path="/t4:test/state/reset", methods={"GET", "POST"}, handler=reset_state },
     { path="/t4:test/state/get-last-reset-time", methods={"GET", "POST"}, handler=get_reset_time },
     { path="/t4:test/state/get-reset-history", methods={"GET", "POST"}, handler=get_reset_history },
-    { path="/t4:test/state/users/*/set-age", methods={"POST"}, handler=set_age },
-    { path="/t4:test/state/users/*", methods={"DELETE"}, handler=delete_user },
+    { path="/t4:test/state/users", methods={"GET", "POST"}, handler=createget_users },
+    { path="/t4:test/state/users/*", methods={"PUT", "DELETE"}, handler=modifydelete_user },
+    { path="/t4:test/state/users/*/set-age", methods={"POST"}, handler=set_user_age },
 }
diff --git a/models/test.xml b/models/test.xml
index 0b532e7..62b9cd6 100644
--- a/models/test.xml
+++ b/models/test.xml
@@ -43,10 +43,16 @@
             <VALUE name="false" value="false"/>
           </NODE>
           <NODE name="groups" help="This is a leaf list of integers">
-            <NODE name="*" mode="rw" help="Member of group" range="1..9"/>
+            <NODE name="*" mode="rw" help="Member of group" range="1..999"/>
           </NODE>
         </NODE>
       </NODE>
+      <NODE name="rules" help="This is a list of rules with numerical indexes">
+        <NODE name="*" help="The rule entry with key index">
+          <NODE name="index" mode="rw" help="integer" range="1..999"/>
+          <NODE name="name" mode="rw" help="This is the name of the rule"/>
+        </NODE>
+      </NODE>
     </NODE>
     <NODE name="state" help="State">
       <NODE name="counter" mode="r" default="0" help="uint32" range="0..4294967295"/>
diff --git a/models/test4:rpc.xml b/models/test4:rpc.xml
index 401bb20..63c5502 100644
--- a/models/test4:rpc.xml
+++ b/models/test4:rpc.xml
@@ -39,7 +39,20 @@
         <NODE name="*" help="The user entry with key name">
           <NODE name="name" mode="rw" help="This is the name of the user"/>
           <NODE name="age" mode="rw" help="Age of the user" range="0..4294967295"/>
-          <NODE name="_" mode="rwx" help="Delete a user"/>
+          <NODE name="_" mode="rwx" help="get/add/delete users">
+            <NODE name="input" help="Input parameters">
+              <NODE name="name" mode="w" help="User name"/>
+              <NODE name="age" mode="w" help="User age" range="0..4294967295"/>
+            </NODE>
+            <NODE name="output" help="Input parameters">
+              <NODE name="users" help="This is a list of users">
+                <NODE name="*" help="The user entry with key name">
+                  <NODE name="name" mode="r" help="User name"/>
+                  <NODE name="age" mode="r" help="User age" range="0..4294967295"/>
+                </NODE>
+              </NODE>
+            </NODE>
+          </NODE>
           <NODE name="set-age" mode="rwx" help="Set the users age">
             <NODE name="input" help="Input parameters">
               <NODE name="age" mode="w" help="New age" range="0..4294967295"/>
diff --git a/schema.c b/schema.c
index 65035b2..2a19f1a 100644
--- a/schema.c
+++ b/schema.c
@@ -3392,6 +3392,13 @@ sch_traverse_tree (sch_instance * instance, sch_node * schema, GNode * node, int
     return rc;
 }
 
+static int _sch_strcmp_ll (const char *stra, const char *strb)
+{
+    int a = g_ascii_strtoll (stra, NULL, 10);
+    int b = g_ascii_strtoll (strb, NULL, 10);
+    return a - b;
+}
+
 static json_t *
 _sch_gnode_to_json (sch_instance * instance, sch_node * schema, xmlNs *ns, GNode * node, int flags, int depth)
 {
@@ -3488,8 +3495,12 @@ _sch_gnode_to_json (sch_instance * instance, sch_node * schema, xmlNs *ns, GNode
 
     if (sch_is_leaf_list (schema) && (flags & SCH_F_JSON_ARRAYS))
     {
+        sch_node *kschema = sch_node_child_first (schema);
+        if (kschema && xmlHasProp ((xmlNode *)kschema, (const xmlChar *)"range"))
+            apteryx_sort_children (node, _sch_strcmp_ll);
+        else
+            apteryx_sort_children (node, g_strcmp0);
         data = json_array ();
-        apteryx_sort_children (node, g_strcmp0);
 
         DEBUG (flags, "%*s%s[", depth * 2, " ", APTERYX_NAME (node));
         for (GNode * child = node->children; child; child = child->next)
@@ -3515,8 +3526,12 @@ _sch_gnode_to_json (sch_instance * instance, sch_node * schema, xmlNs *ns, GNode
     }
     else if (sch_is_list (schema) && (flags & SCH_F_JSON_ARRAYS))
     {
+        sch_node *kschema = sch_node_child_first (sch_node_child_first(schema));
+        if (kschema && xmlHasProp ((xmlNode *)kschema, (const xmlChar *)"range"))
+            apteryx_sort_children (node, _sch_strcmp_ll);
+        else
+            apteryx_sort_children (node, g_strcmp0);
         data = json_array ();
-        apteryx_sort_children (node, g_strcmp0);
         for (GNode * child = node->children; child; child = child->next)
         {
             DEBUG (flags, "%*s%s[%s]\n", depth * 2, " ", APTERYX_NAME (node),