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diff --git a/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/api/idp/process/ProcessInstanceStoreDao.java b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/api/idp/process/ProcessInstanceStoreDao.java
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+++ b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/api/idp/process/ProcessInstanceStoreDao.java
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+/*
+ * 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.
+*/
+
+package at.gv.egiz.eaaf.core.api.idp.process;
+
+import at.gv.egiz.eaaf.core.exceptions.EaafException;
+import at.gv.egiz.eaaf.core.exceptions.EaafStorageException;
+import at.gv.egiz.eaaf.core.impl.idp.process.ProcessInstance;
+import at.gv.egiz.eaaf.core.impl.idp.process.dao.ProcessInstanceStore;
+
+public interface ProcessInstanceStoreDao {
+
+  /**
+   * Stores a {@link ProcessInstance} defined by {@code pIStore} in the database.
+   *
+   * @param piStore the {@link ProcessInstanceStore} to persist.
+   * @throws EaafStorageException is thrown if a problem occurs while accessing the database.
+   */
+  void saveOrUpdate(ProcessInstanceStore piStore) throws EaafException;
+
+  /**
+   * Returns a {@link ProcessInstanceStore}, defined by {@code processInstanceID} from the database,
+   * or {@code null} if the object could not be found.
+   *
+   * @param processInstanceId the id of the {@code ProcessInstanceStore} to retrieve.
+   * @return a ProcessInstanceStore, or {@code null}.
+   * @throws EaafStorageException is thrown if a problem occurs while accessing the database.
+   */
+  ProcessInstanceStore load(String processInstanceId) throws EaafException;
+
+  /**
+   * Deletes the {@link ProcessInstance} corresponding with the {@code processInstanceId}.
+   *
+   * @param processInstanceId the id of the {@code ProcessInstance} to be deleted.
+   * @throws EaafStorageException is thrown if a problem occurs while accessing the database.
+   */
+  void remove(String processInstanceId) throws EaafException;
+
+}