--- /dev/null
+@*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ *@
+
+@**********************************************************
+* Twirl YangTemplate for generating yang snippets. *
+* Twirl is transformed to Scala and compiled. Then, *
+* it can be called from Java with particular input *
+* parameters to render desired output code. *
+* *
+* Note: we should introduce our own format instead of txt *
+***********************************************************@
+
+@import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode
+
+@(unknownSchemaNode: UnknownSchemaNode)
+@if(unknownSchemaNode != null) {
+ test
+ @* to do *@
+}
\ No newline at end of file