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diff --git a/src/de/lmu/ifi/dbs/elki/algorithm/classification/Classifier.java b/src/de/lmu/ifi/dbs/elki/algorithm/classification/Classifier.java
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+package de.lmu.ifi.dbs.elki.algorithm.classification;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2014
+ 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.algorithm.Algorithm;
+import de.lmu.ifi.dbs.elki.data.ClassLabel;
+import de.lmu.ifi.dbs.elki.database.Database;
+import de.lmu.ifi.dbs.elki.database.relation.Relation;
+
+/**
+ * A Classifier is to hold a model that is built based on a database, and to
+ * classify a new instance of the same type.
+ * 
+ * @author Arthur Zimek
+ *
+ * @param <O> the type of DatabaseObjects handled by this Algorithm
+ */
+public interface Classifier<O> extends Algorithm {
+  /**
+   * Performs the training. Sets available labels.
+   * 
+   * @param database the database to build the model on
+   * @param classLabels the classes to be learned
+   */
+  public void buildClassifier(Database database, Relation<? extends ClassLabel> classLabels);
+
+  /**
+   * Classify a single instance.
+   * 
+   * @param instance an instance to classify
+   * @return predicted class label of the given instance
+   */
+  public ClassLabel classify(O instance);
+
+  /**
+   * Produce a String representation of the classification model.
+   * 
+   * @return a String representation of the classification model
+   */
+  public String model();
+}
+\ No newline at end of file