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diff --git a/src/de/lmu/ifi/dbs/elki/index/preprocessed/LocalProjectionIndex.java b/src/de/lmu/ifi/dbs/elki/index/preprocessed/LocalProjectionIndex.java
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+package de.lmu.ifi.dbs.elki.index.preprocessed;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+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 de.lmu.ifi.dbs.elki.data.NumberVector;
+import de.lmu.ifi.dbs.elki.database.ids.DBID;
+import de.lmu.ifi.dbs.elki.database.relation.Relation;
+import de.lmu.ifi.dbs.elki.index.Index;
+import de.lmu.ifi.dbs.elki.index.IndexFactory;
+import de.lmu.ifi.dbs.elki.math.linearalgebra.ProjectionResult;
+
+/**
+ * Abstract index interface for local projections
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.has ProjectionResult
+ * 
+ * @param <V> Vector type
+ * @param <P> Projection result type
+ */
+public interface LocalProjectionIndex<V extends NumberVector<?, ?>, P extends ProjectionResult> extends Index {
+  /**
+   * Get the precomputed local projection for a particular object ID.
+   * 
+   * @param objid Object ID
+   * @return local projection
+   */
+  public P getLocalProjection(DBID objid);
+
+  /**
+   * Factory
+   * 
+   * @author Erich Schubert
+   * 
+   * @apiviz.stereotype factory
+   * @apiviz.uses LocalProjectionIndex oneway - - «create»
+   * 
+   * @param <V> Vector type
+   * @param <I> Index type
+   */
+  public static interface Factory<V extends NumberVector<?, ?>, I extends LocalProjectionIndex<V, ?>> extends IndexFactory<V, I> {
+    /**
+     * Instantiate the index for a given database.
+     * 
+     * @param relation Relation to use
+     * 
+     * @return Index
+     */
+    @Override
+    public I instantiate(Relation<V> relation);
+  }
+}
+\ No newline at end of file