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diff --git a/winery/org.eclipse.winery.topologymodeler/src/main/java/org/eclipse/winery/topologymodeler/addons/topologycompleter/helper/Constants.java b/winery/org.eclipse.winery.topologymodeler/src/main/java/org/eclipse/winery/topologymodeler/addons/topologycompleter/helper/Constants.java
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+++ b/winery/org.eclipse.winery.topologymodeler/src/main/java/org/eclipse/winery/topologymodeler/addons/topologycompleter/helper/Constants.java
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+/*******************************************************************************
+ * Copyright (c) 2013 Pascal Hirmer.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *    Pascal Hirmer - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.winery.topologymodeler.addons.topologycompleter.helper;
+
+import javax.xml.namespace.QName;
+
+import org.eclipse.winery.topologymodeler.addons.topologycompleter.topologycompletion.CompletionInterface;
+
+/**
+ * This class contains several constants used by the completion add-on.
+ */
+public class Constants {
+
+	/**
+	 * Constant for the QName of the "deferred" type.
+	 */
+	public static final QName DEFERRED_QNAME = new QName("http://www.opentosca.org", "deferred");
+
+	/**
+	 * Constant for the QName of the "PlaceHolder" type.
+	 */
+	public static final QName PLACE_HOLDER_QNAME = new QName("http://www.opentosca.org", "PlaceHolder");
+
+	/**
+	 * Contains possible types of expandable place holders.
+	 */
+	public enum PlaceHolders {
+		WEBSERVER, DATABASE, OPERATINGSYSTEM, CLOUDPROVIDER;
+
+		/**
+		 * Overwritten toString() method to return formatted strings.
+		 */
+		public String toString() {
+
+			switch (this) {
+				case WEBSERVER:
+					return "Webserver";
+				case DATABASE:
+					return "Database";
+				case OPERATINGSYSTEM:
+					return "OperatingSystem";
+				case CLOUDPROVIDER:
+					return "CloudProvider";
+				default:
+					return null;
+			}
+		}
+	}
+
+	/**
+	 * The messages returned by the {@link CompletionInterface}
+	 */
+	public enum CompletionMessages {
+		TOPOLOGYCOMPLETE, USERINTERACTION, STEPBYSTEP, SUCCESS, USERTOPOLOGYSELECTION, FAILURE;
+
+		/**
+		 * Overwritten toString() method to return formatted strings.
+		 */
+		public String toString() {
+
+			switch (this) {
+				case TOPOLOGYCOMPLETE:
+					return "topologyComplete";
+				case USERINTERACTION:
+					return "userInteraction";
+				case STEPBYSTEP:
+					return "stepByStep";
+				case SUCCESS:
+					return "success";
+				case USERTOPOLOGYSELECTION:
+					return "userTopologySelection";
+				case FAILURE:
+					return "failure";
+				default:
+					return null;
+			}
+		}
+	}
+}