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diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/timely/TimestampTransformation.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/timely/TimestampTransformation.java
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+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/timely/TimestampTransformation.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2019, Tamas Szabo, Istvan Rath and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.rete.network.communication.timely;
+
+import tools.refinery.viatra.runtime.rete.network.Node;
+import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
+
+/**
+ * Values of this enum perform different kind of preprocessing on {@link Timestamp}s. 
+ * This is used on edges leading in and out from {@link Node}s in recursive {@link TimelyCommunicationGroup}s. 
+ * 
+ * @author Tamas Szabo
+ * @since 2.3
+ */
+public enum TimestampTransformation {
+
+    INCREMENT {
+        @Override
+        public Timestamp process(final Timestamp timestamp) {
+            return new Timestamp(timestamp.getValue() + 1);
+        }
+        
+        @Override
+        public String toString() {
+            return "INCREMENT";
+        }
+    },
+    RESET {
+        @Override
+        public Timestamp process(final Timestamp timestamp) {
+            return Timestamp.ZERO;
+        }
+        
+        @Override
+        public String toString() {
+            return "RESET";
+        }
+    };
+
+    public abstract Timestamp process(final Timestamp timestamp);
+
+}