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diff --git a/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/PrefExp.java b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/PrefExp.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;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+import pddl4j.exp.term.Substitution;
+import pddl4j.exp.term.Term;
+import pddl4j.exp.term.Variable;
+
+/**
+ * This class implements the common methods of all preference expressions of the
+ * PDDL language.
+ * 
+ * @author Damien Pellier
+ * @version 1.0
+ */
+public class PrefExp extends AbstractExp {
+
+    /**
+     * The serial version id of the class.
+     */
+    private static final long serialVersionUID = 2518753354183976408L;
+
+    /**
+     * The name of this preference.
+     */
+    private String name;
+
+    /**
+     * The goal description of the preference.
+     */
+    private Exp exp;
+
+    /**
+     * Creates a new preference expression with a specific expression name and
+     * expression preference.
+     * 
+     * @param name The name of the preference.
+     * @param exp The preference expression.
+     * @throws NullPointerException if <code>name == null</code> or
+     *             <code>exp == null</code>.
+     */
+    public PrefExp(String name, Exp exp) {
+        super(ExpID.PREFERENCE);
+        if (name == null || exp == null)
+            throw new NullPointerException();
+        this.name = name;
+        this.exp = exp;
+    }
+
+    /**
+     * Creates a new preference expression with a specific expression
+     * preference.
+     * 
+     * @param exp The preference expression.
+     * @throws NullPointerException if <code>exp == null</code>.
+     */
+    public PrefExp(Exp exp) {
+        this(new String(), exp);
+    }
+
+    /**
+     * Returns the name of the preference expression.
+     * 
+     * @return the name of the preference expression.
+     */
+    public final String getName() {
+        return this.name;
+    }
+
+    /**
+     * Sets a new name to the preference expression.
+     * 
+     * @param name the new name to set.
+     * @throws NullPointerException if <code>name == null</code>.
+     */
+    public final void setName(String name) {
+        if (name == null)
+            throw new NullPointerException();
+        this.name = name;
+    }
+
+    /**
+     * Returns the expression describing the preference.
+     * 
+     * @return the expression describing the preference.
+     */
+    public final Exp getExp() {
+        return this.exp;
+    }
+
+    /**
+     * Sets a new expression describing the preference.
+     * 
+     * @param exp the new expression describing the preference.
+     * @throws NullPointerException if <code>exp == null</code>.
+     */
+    public final void setExp(Exp exp) {
+        if (exp == null)
+            throw new NullPointerException();
+        this.exp = exp;
+    }
+
+    /**
+     * Returns <code>true</code> if a term occurs in this preference
+     * expression.
+     * 
+     * @param term the term to be tested.
+     * @return <code>true</code> if a term occurs in this preference
+     *         expression; <code>false</code> otherwise.
+     * @throws NullPointerException if <code>term == null</code>.        
+     */
+    public final boolean occurs(Term term) {
+        if (term == null)
+            throw new NullPointerException();
+        return this.exp.occurs(term);
+    }
+
+    /**
+     * Substitutes all occurrences of the variables that occur in this
+     * expression and that are mapped in the substitution by its binding
+     * expression.
+     * 
+     * @param sigma the substitution.
+     * @return a substituted copy of this expression.
+     * @throws NullPointerException if <code>sigma == null</code>.
+     */
+    public PrefExp apply(Substitution sigma) {
+        if (sigma == null)
+            throw new NullPointerException();
+        return new PrefExp(this.name, this.exp.apply(sigma));
+    }
+
+    /**
+     * Standardizes all occurrences of the variables that occur in this
+     * expression. Remember that free variables are existentially quantified.
+     * 
+     * @return a standardized copy of this expression.
+     * @see pddl4j.exp.Exp#standardize()
+     */
+    public PrefExp standardize() {
+        return this.standardize(new LinkedHashMap<String, String>());
+    }
+
+    /**
+     * Standardizes all occurrences of the variables that occur in this
+     * expression. The map argument is used to store the variable already
+     * standardized. Remember that free variables are existentially quantified.
+     * 
+     * @param images the object that maps old variable images to the standardize
+     *            image.
+     * @return a standardized copy of this expression.
+     * @throws NullPointerException if <code>images == null</code>.
+     * @see pddl4j.exp.Exp#standardize(Map)
+     */
+    public PrefExp standardize(Map<String, String> images) {
+        if (images == null)
+            throw new NullPointerException();
+        return new PrefExp(this.exp.standardize(images));
+    }
+
+    /**
+     * Returns <code>true</code> if the expression is ground.
+     * 
+     * @return <code>true</code> if the expression is ground;
+     *         <code>false</code>otherwise.
+     * @see pddl4j.exp.Exp#isGround()
+     */
+    public final boolean isGround() {
+        return this.exp.isGround();
+    }
+
+    /**
+     * Returns <code>true</code> if this preference expression is equal to an
+     * other object, i.e., if the object is a not null reference to an instance
+     * of the class <code>PrefExp</code> and both preference expressions have
+     * the name and expression.
+     * 
+     * @param obj The reference object with which to compare.
+     * @return <code>true</code> if this preference expression is equal to an
+     *         other object; <code>false</code> otherwise.
+     */
+    public boolean equals(Object obj) {
+        if (obj != null && obj instanceof PrefExp) {
+            PrefExp other = (PrefExp) obj;
+            return this.getExpID().equals(other.getExpID())
+                        && this.name.equals(other.name)
+                        && this.exp.equals(other.exp);
+        }
+        return false;
+    }
+
+    /**
+     * Returns a hash code value for the preference expression. This method is
+     * supported for the benefit of hash tables such as those provided by
+     * <code>java.util.Hashtable</code>.
+     * 
+     * @return a hash code value for the preference expression.
+     */
+    public int hashCode() {
+        return this.getExpID().hashCode() + this.name.hashCode()
+                    + this.exp.hashCode();
+    }
+
+    /**
+     * Creates and returns a copy of this expression.
+     * 
+     * @return a clone of this expression instance.
+     * @see pddl4j.exp.Exp#clone()
+     */
+    public PrefExp clone() {
+        PrefExp other = (PrefExp) super.clone();
+        other.exp = this.exp.clone();
+        return other;
+    }
+    
+    /**
+     * Returns a copy of this expression such that the quantifiers appear first.
+     * 
+     * @return a copy of this expression such that the quantifiers appear first.
+     * @see pddl4j.exp.Exp#moveQuantifierOutward()
+     */
+    public Exp moveQuantifierOutward() {
+        return new PrefExp(this.name, this.exp.moveQuantifierOutward());
+    }
+    
+    /**
+     * Return the disjunctive normal form of this expression. Note, the
+     * expression returned is a copy. 
+     * 
+     * @return the disjunctive normal form of this expression.
+     * @see pddl4j.exp.Exp#toDisjunctiveNormalForm()
+     */
+    public PrefExp toDisjunctiveNormalForm() {
+        return new PrefExp(this.name, this.exp.toDisjunctiveNormalForm());
+    }
+    
+    /**
+     * Returns the conjunctive normal form of this expression. Note, the
+     * expression returned is a copy.
+     * 
+     * @return the conjunctive normal form of this expression.
+     * @see pddl4j.exp.Exp#toConjunctiveNormalForm()
+     */
+    public PrefExp toConjunctiveNormalForm() {
+        return new PrefExp(this.name, this.exp.toConjunctiveNormalForm());
+    }
+    
+    /**
+     * Returns the negative normal form of this expression. Note, the expression
+     * returned is a copy. 
+     * 
+     * @return the negative normal form of this expression.
+     * @see pddl4j.exp.Exp#toNegativeNormalForm()
+     */
+    public PrefExp toNegativeNormalForm() {
+        return new PrefExp(this.name, this.exp.toNegativeNormalForm());
+    }
+    
+    /**
+     * Returns the set of free variables of this expression.
+     * 
+     * @return the set of free variables of this expression.
+     */
+    public Set<Variable> getFreeVariables() {
+        return this.exp.getFreeVariables();
+    }
+    
+    /**
+     * Returns a string representation of the preference expression.
+     * 
+     * @return a string representation of the preference expression.
+     */
+    public String toString() {
+        StringBuffer str = new StringBuffer();
+        str.append("(preference ");
+        str.append(this.name.toString());
+        str.append(" ");
+        str.append(this.exp.toString());
+        str.append(")");
+        return str.toString();
+    }
+
+    /**
+     * Returns a typed string representation of the preference expression.
+     * 
+     * @return a typed string representation of the preference expression.
+     */
+    public String toTypedString() {
+        StringBuffer str = new StringBuffer();
+        str.append("(preference ");
+        str.append(this.name.toString());
+        str.append(" ");
+        str.append(this.exp.toTypedString());
+        str.append(")");
+        return str.toString();
+    }
+}