--- a
+++ b/src/main/java/org/sba_research/timbus/kb/ToolKnowledgeBase.java
@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) 2013/2014 Verein zur Foerderung der IT-Sicherheit in Oesterreich (SBA).
+ * The work has been developed in the TIMBUS Project and the above-mentioned are Members of the TIMBUS Consortium.
+ * TIMBUS is supported by the European Union under the 7th Framework Programme for research and technological
+ * development and demonstration activities (FP7/2007-2013) under grant agreement no. 269940.
+ *
+ * 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, including without
+ * limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTIBITLY, or FITNESS FOR A PARTICULAR
+ * PURPOSE. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise,
+ * unless required by applicable law or agreed to in writing, shall any Contributor be liable for damages, including
+ * any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this
+ * License or out of the use or inability to use the Work.
+ * See the License for the specific language governing permissions and limitation under the License.
+ */
+package org.sba_research.timbus.kb;
+
+import org.apache.commons.lang3.tuple.Pair;
+
+import java.util.List;
+
+public interface ToolKnowledgeBase {
+    /**
+     * Returns tools that provide a specific action.
+     *
+     * @param action The action fragment.
+     * @return A list of tool IRIs.
+     */
+    List<String> getProvidingTools(String action);
+
+    /**
+     * Returns a list of alternative tools.
+     * Alternatives are all tools that provide at least the same actions as the tool for which an
+     * alternative is searched.
+     *
+     * @param tool The tool fragment.
+     * @return A list of tool IRIs.
+     */
+    List<String> getAlternativeTools(String tool);
+
+    /**
+     * Returns a list of tools that support the given input and output format.
+     *
+     * @param format A input (left) /output (right) format pair.
+     * @return A list of tool IRIs.
+     */
+    List<String> getSupportingTools(Pair<String, String> format);
+
+    /**
+     * @return Returns a list of Pronom IDs of all formats.
+     */
+    List<String> getAllFormatIDs();
+
+    /**
+     * Returns the format name of a given ID.
+     * @param formatID The Pronom ID of a format.
+     * @return A format IRI.
+     */
+    List<String> getFormatName(String formatID);
+
+    /**
+     * Returns tools and their output formats that support a specified input format.
+     *
+     * @param formatID The Pronom ID of a format.
+     * @return A list of possible migration options.
+     */
+    List<FormatMigrationOption> getFormatMigrationOption(String formatID);
+}