[ONOS-5088] YANG SBI Broker Implementation.

Change-Id: Ibe87e095a4c209c54e3e90aceca0ec9097c5ede0
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/XmlCodecSingleInstanceLeafHandler.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/XmlCodecSingleInstanceLeafHandler.java
new file mode 100644
index 0000000..f44f9b2
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/XmlCodecSingleInstanceLeafHandler.java
@@ -0,0 +1,34 @@
+/*
+ * 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.ych.defaultcodecs.xml;
+
+import org.dom4j.Element;
+import org.onosproject.yms.ydt.YdtContext;
+
+import java.util.Stack;
+
+/**
+ * Represents a single instance leaf node handler in YCH.
+ */
+public class XmlCodecSingleInstanceLeafHandler extends XmlCodecHandler {
+
+    @Override
+    public void setXmlValue(YdtContext ydtContext,
+                            Stack<Element> elementStack) {
+        elementStack.peek().setText(ydtContext.getValue());
+    }
+}