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diff --git a/src/de/lmu/ifi/dbs/elki/math/spacefillingcurves/SpatialSorter.java b/src/de/lmu/ifi/dbs/elki/math/spacefillingcurves/SpatialSorter.java
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+++ b/src/de/lmu/ifi/dbs/elki/math/spacefillingcurves/SpatialSorter.java
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+package de.lmu.ifi.dbs.elki.math.spacefillingcurves;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2012
+ 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.List;
+
+import de.lmu.ifi.dbs.elki.data.spatial.SpatialComparable;
+
+/**
+ * Interface for spatial sorting - ZCurves, Peano curves, Hilbert curves, ...
+ * 
+ * @author Erich Schubert
+ */
+public interface SpatialSorter {
+  /**
+   * Partitions the specified feature vectors
+   * 
+   * @param <T> actual type we sort
+   * @param objs the spatial objects to be sorted
+   */
+  public <T extends SpatialComparable> void sort(List<T> objs);
+
+  /**
+   * Sort part of the list (start to end).
+   * 
+   * @param <T> actual type we sort
+   * @param objs the spatial objects to be sorted
+   * @param start First index to sort (e.g. 0)
+   * @param end End of range (e.g. <code>site()</code>)
+   * @param minmax Array with dim pairs of (min, max) of value ranges
+   */
+  public <T extends SpatialComparable> void sort(List<T> objs, int start, int end, double[] minmax);
+}