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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/data/uncertain/UncertainObject.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/data/uncertain/UncertainObject.java
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+++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/data/uncertain/UncertainObject.java
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+package de.lmu.ifi.dbs.elki.data.uncertain;
+
+/*
+ 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/>.
+ */
+
+import java.util.Random;
+
+import de.lmu.ifi.dbs.elki.data.DoubleVector;
+import de.lmu.ifi.dbs.elki.data.FeatureVector;
+import de.lmu.ifi.dbs.elki.data.spatial.SpatialComparable;
+
+/**
+ * Interface for uncertain objects.
+ *
+ * Uncertain objects <em>must</em> provide a bounding box in this model, and
+ * have an option to randomly sample from the data.
+ *
+ * TODO: Eventually allow float precision, too.
+ *
+ * @author Erich Schubert
+ *
+ * @apiviz.has DoubleVector oneway - «contains/produces»
+ */
+public interface UncertainObject extends SpatialComparable, FeatureVector<Double> {
+  /**
+   * Draw a random sampled instance.
+   *
+   * @param rand Random generator
+   * @return Sampled object.
+   */
+  DoubleVector drawSample(Random rand);
+
+  /**
+   * Get the center of mass of the uncertain object.
+   *
+   * @return Center of mass.
+   */
+  DoubleVector getCenterOfMass();
+}
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