[New] added a new StrolchRootElement interface for Resource and Order

src/main/java/li/strolch/model/Order.java

@@ -33,10 +33,9 @@ import ch.eitchnet.utils.iso8601.ISO8601FormatFactory;
  * In this sense, orders do not need to be verified, so all verifier chracteristics are disabled and the
  * getVerifier()-method will return the null reference
  * 
- * @author eitch
- * 
+ * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public class Order extends GroupedParameterizedElement {
+public class Order extends GroupedParameterizedElement implements StrolchRootElement {
 
 	private static final long serialVersionUID = 0L;
 

src/main/java/li/strolch/model/Resource.java

@@ -23,7 +23,7 @@ import org.w3c.dom.Element;
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public class Resource extends GroupedParameterizedElement {
+public class Resource extends GroupedParameterizedElement implements StrolchRootElement {
 
 	private static final long serialVersionUID = 0L;
 

src/main/java/li/strolch/model/StrolchRootElement.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
+ * 
+ * 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 li.strolch.model;
+
+/**
+ * Root element for all top level {@link StrolchElement}. These are elements which have no parent, e.g. {@link Resource
+ * Resources} and {@link Order Orders}
+ * 
+ * @author Robert von Burg <eitch@eitchnet.ch>
+ */
+public interface StrolchRootElement extends StrolchElement {
+
+	// marker interface
+}