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diff --git a/org.argeo.slc.core/src/org/argeo/slc/core/execution/generator/ExecutionFlowGeneratorSource.java b/org.argeo.slc.core/src/org/argeo/slc/core/execution/generator/ExecutionFlowGeneratorSource.java
new file mode 100644
index 000000000..8d699c660
--- /dev/null
+++ b/org.argeo.slc.core/src/org/argeo/slc/core/execution/generator/ExecutionFlowGeneratorSource.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * 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 org.argeo.slc.core.execution.generator;
+
+import java.util.List;
+
+/**
+ * Provides 2 types of information required by an <code>ExecutionFlowGenerator</code>: 
+ * a list of <code>RunnableCallFlowDescriptor</code> used to create <code>RunnableCallFlow</code>
+ * and a list of <code>RunnableDataNode</code> used to create any kind of flow via a factory.
+ */
+public interface ExecutionFlowGeneratorSource {
+	
+	/**
+	 * @return a list of <code>RunnableCallFlowDescriptor</code> used 
+	 * by a <code>ExecutionFlowGenerator</code> to create <code>RunnableCallFlow</code>
+	 */
+	public List<RunnableCallFlowDescriptor> getRunnableCallFlowDescriptors();
+	
+	/**
+	 * @return a list of <code>RunnableDataNode</code> used 
+	 * by a <code>ExecutionFlowGenerator</code> to create any kind of flow via a factory
+	 */
+	public List<RunnableDataNode> getRunnableDataNodes();
+	
+}