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diff --git a/eaaf_core_api/src/main/java/at/gv/egiz/eaaf/core/api/IRequestStorage.java b/eaaf_core_api/src/main/java/at/gv/egiz/eaaf/core/api/IRequestStorage.java
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+++ b/eaaf_core_api/src/main/java/at/gv/egiz/eaaf/core/api/IRequestStorage.java
@@ -0,0 +1,90 @@
+/*******************************************************************************
+ * Copyright 2017 Graz University of Technology
+ * EAAF-Core Components has been developed in a cooperation between EGIZ,  
+ * A-SIT Plus, A-SIT, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * https://joinup.ec.europa.eu/news/understanding-eupl-v12
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *  
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ *******************************************************************************/
+/*******************************************************************************
+ *******************************************************************************/
+/*******************************************************************************
+ *******************************************************************************/
+/*
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.eaaf.core.api;
+
+
+import at.gv.egiz.eaaf.core.exceptions.EAAFException;
+import at.gv.egiz.eaaf.core.exceptions.PendingReqIdValidationException;
+
+/**
+ * @author tlenz
+ *
+ */
+public interface IRequestStorage {
+
+	/**
+	 * Get a pending-request from storage
+	 * 
+	 * @param pendingReqID Id of the pending request
+	 * @return
+	 * @throws PendingReqIdValidationException if the pendingRequestId was invalid
+	 */
+	public IRequest getPendingRequest(String pendingReqID) throws PendingReqIdValidationException;
+	
+	/**
+	 * Store a pending-request in storage
+	 * 
+	 * @param pendingRequest
+	 * @throws EAAFException
+	 */
+	public void storePendingRequest(IRequest pendingRequest) throws EAAFException;
+	
+	/**
+	 * Remove a pending-request from storage
+	 * 
+	 * @param pendingReqId Id of the pending request
+	 */
+	public void removePendingRequest(String pendingReqId);
+	
+	/**
+	 * change the pendingRequestId of a pending-request
+	 * 
+	 * @param pendingRequest current pending-reqeust
+	 * @return new pending-requestId
+	 * @throws EAAFException
+	 */
+	public String changePendingRequestID(IRequest pendingRequest) throws EAAFException;
+	
+}