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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/result/HierarchicalResult.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/result/HierarchicalResult.java
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+package de.lmu.ifi.dbs.elki.result;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2015
+ Ludwig-Maximilians-Universität München
+ Lehr- und Forschungseinheit für Datenbanksysteme
+ ELKI Development Team
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/**
+ * Result with an internal hierarchy.
+ * 
+ * Note: while this often seems a bit clumsy to use, the benefit of having this
+ * delegate is to keep the APIs simpler, and thus make ELKI development easier.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.composedOf ResultHierarchy
+ */
+public interface HierarchicalResult extends Result {
+  /**
+   * Get the objects current hierarchy - may be {@code null}!
+   * 
+   * @return current hierarchy. May be {@code null}!
+   */
+  public ResultHierarchy getHierarchy();
+
+  /**
+   * Set (exchange) the hierarchy implementation (e.g. after merging!)
+   * 
+   * @param hierarchy New hierarchy
+   */
+  public void setHierarchy(ResultHierarchy hierarchy);
+}