diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java
new file mode 100644
index 0000000..ed16951
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents type of YANG data tree node operation.
+ */
+enum RequestedCardinality {
+
+    /**
+     * Single instance of requested node.
+     */
+    SINGLE_INSTANCE,
+
+    /**
+     * Multi instance of requested node.
+     */
+    MULTI_INSTANCE,
+
+    /**
+     * Instance of requested node/leaf is unknown.
+     */
+    UNKNOWN,
+
+    /**
+     * Single instance of requested leaf.
+     */
+    SINGLE_INSTANCE_LEAF,
+
+    /**
+     * Multi instance of requested leaf.
+     */
+    MULTI_INSTANCE_LEAF
+}
+