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diff --git a/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/fexp/NArityOp.java b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/fexp/NArityOp.java
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+++ b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/fexp/NArityOp.java
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+/*
+ * Copyright Dept. of Mathematics & Computer Science Univ. Paris-Descartes
+ *
+ * This software is governed by the CeCILL  license under French law and
+ * abiding by the rules of distribution of free software.  You can  use,
+ * modify and/ or redistribute the software under the terms of the CeCILL
+ * license as circulated by CEA, CNRS and INRIA at the following URL
+ * "http://www.cecill.info".
+ *
+ * As a counterpart to the access to the source code and  rights to copy,
+ * modify and redistribute granted by the license, users are provided only
+ * with a limited warranty  and the software's author,  the holder of the
+ * economic rights,  and the successive licensors  have only  limited
+ * liability.
+ *
+ * In this respect, the user's attention is drawn to the risks associated
+ * with loading,  using,  modifying and/or developing or reproducing the
+ * software by the user in light of its specific status of free software,
+ * that may mean  that it is complicated to manipulate,  and  that  also
+ * therefore means  that it is reserved for developers  and  experienced
+ * professionals having in-depth computer knowledge. Users are therefore
+ * encouraged to load and test the software's suitability as regards their
+ * requirements in conditions enabling the security of their systems and/or
+ * data to be ensured and,  more generally, to use and operate it in the
+ * same conditions as regards security.
+ *
+ * The fact that you are presently reading this means that you have had
+ * knowledge of the CeCILL license and that you accept its terms.
+ */
+
+package pddl4j.exp.fexp;
+
+import pddl4j.exp.term.Term;
+
+/**
+ * This class implements an numeric function od arity n of the PDDL langage.
+ * 
+ * @author Damien Pellier
+ * @version 1.0
+ */
+public abstract class NArityOp extends OpExp {
+
+    /**
+     * Creates a new arithmetic expression.
+     * 
+     * @param op the arithmetic operator.
+     * @throws NullPointerException if <code>op == null</code>.
+     */
+    protected NArityOp(Op op) {
+        super(op);
+    }
+    
+    /**
+     * Adds a new argument to this function.
+     * 
+     * @param arg The argument to add.
+     * @return <code>true</code> if the arg was added; <code>false</code>
+     *         otherwise.
+     * @throws NullPointerException if <code>arg == null</code>.
+     */
+    public final boolean add(Term arg) {
+        return super.add(arg);
+    }
+
+    /**
+     * Returns the argument at the specified position in this function.
+     * 
+     * @param index index of the argument to return.
+     * @return the argument at the specified position in this function.
+     * @throws IndexOutOfBoundsException if the index is out of range 
+     *      (<code>index < 0  || index >= getArity()</code>).
+     */
+    public final Term get(int index) {
+        return super.get(index);
+    }
+    
+    /**
+     * Replaces the argument at the specified position in this function with the
+     * specified term.
+     * 
+     * @param index index of the argument to replace.
+     * @param arg argument to be stored at the specified position.
+     * @return the argument previously at the specified position.
+     * @throws IndexOutOfBoundsException if the index is out of range 
+     *      (<code>index < 0  || index >= getArity()</code>).
+     * @throws NullPointerException if <code>arg == null</code>.
+     */
+    public final Term set(int index, Term arg) {
+        return super.set(index, arg);
+    }
+}