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diff --git a/SA_POP/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/time/TimedLiteral.java b/SA_POP/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/time/TimedLiteral.java
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+++ b/SA_POP/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/time/TimedLiteral.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.time;
+
+import java.util.LinkedHashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import pddl4j.exp.Literal;
+import pddl4j.exp.fexp.Number;
+import pddl4j.exp.term.Substitution;
+import pddl4j.exp.term.Term;
+
+/**
+ * This class implements a timed literal used in initial state definition of the
+ * PDDL language.
+ * 
+ * @author Damien Pellier
+ * @version 1.0
+ */
+public class TimedLiteral extends TimedExp implements Literal {
+
+    /**
+     * The serial version id of the class.
+     */
+    private static final long serialVersionUID = -1735624931301766305L;
+
+    /**
+     * The time stamp of the timed literal.
+     */
+    private Number ts;
+
+    /**
+     * Creates a new timed literal with a literal.
+     * 
+     * @param time the time stamp of the timed literal.
+     * @param literal the literal of the timed literal.
+     * @throws NullPointerException if <code>time == null</code> or
+     *             <code>literal == null</code>.
+     * @throws IllegalArgumentException if <code>time.getValue() < 0</code>.
+     */
+    public TimedLiteral(Number time, Literal literal) {
+        super(TimedExpID.LITERAL, literal);
+        if (time == null || literal == null)
+            throw new NullPointerException();
+        if (time.getValue() < 0)
+            throw new IllegalArgumentException();
+        this.ts = time;
+    }
+    
+    /**
+     * Returns the literal contained in the timed expression.
+     * 
+     * @return the literal contained in the timed expression.
+     */
+    public Literal getExp() {
+        return (Literal) this.exp;
+    }
+    
+    /**
+     * Returns the time stamp of the timed literal.
+     * 
+     * @return the time stamp of the timed literal.
+     */
+    public Number getTimeStamp() {
+        return this.ts;
+    }
+
+    /**
+     * Sets a new time stamp to the timed literal.
+     * 
+     * @param time the new time stamp to set..
+     * @throws NullPointerException if <code>time == null</code> or
+     *             <code>literal == null</code>.
+     * @throws IllegalArgumentException if <code>time.getValue() < 0</code>.
+     */
+    public void setTimeStamp(Number time) {
+        if (time == null)
+            throw new NullPointerException();
+        if (time.getValue() < 0)
+            throw new IllegalArgumentException();
+        this.ts = time;
+    }
+
+    /**
+     * Adds a new term to the timed literal.
+     * 
+     * @param term the term to add.
+     * @return <code>true</code> if the term was added;
+     *         <code>false</code otherwise.
+     * @throws NullPointerException if <code>term == null</code>.       
+     * @see pddl4j.exp.Literal#add(pddl4j.exp.term.Term)
+     */
+    public boolean add(Term term) {
+        return this.getExp().add(term);
+    }
+
+    /**
+     * Returns the arity of the timed literal.
+     * 
+     * @return the arity of the timed literal.
+     * @see pddl4j.exp.Literal#getArity()
+     */
+    public int getArity() {
+        return this.getExp().getArity();
+    }
+
+    /**
+     * Returns the predicate of the timed literal.
+     * 
+     * @return the predicate of the timed literal.
+     * @see pddl4j.exp.Literal#getPredicate()
+     */
+    public String getPredicate() {
+        return this.getExp().getPredicate();
+    }
+
+    /**
+     * Returns a iterator over the expression of the timed literal.
+     * 
+     * @return a iterator over the expression of the timed literal.
+     * @see java.lang.Iterable#iterator()
+     */
+    public Iterator<Term> iterator() {
+        return this.getExp().iterator();
+    }
+
+    /**
+     * Substitutes all occurrences of the variables that occur in this
+     * expression and that are mapped in the substitution by its binding
+     * term.
+     * 
+     * @param sigma the substitution.
+     * @return a substituted copy of this expression.
+     * @throws NullPointerException if <code>sigma == null</code>.
+     */
+    public TimedLiteral apply(Substitution sigma) {
+        if (sigma == null)
+            throw new NullPointerException();
+        return new TimedLiteral(this.getTimeStamp().clone(), 
+                    (Literal) this.getExp().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.
+     */
+    public TimedLiteral 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 TimedLiteral standardize(Map<String, String> images) {
+        if (images == null)
+            throw new NullPointerException();
+        return new TimedLiteral(this.getTimeStamp().clone(), (Literal) this
+                    .getExp().standardize(images));
+    }
+
+    /**
+     * Returns <code>true</code> if the timed literal is equal to an other
+     * object, i.e., if the object is a not null reference to an instance of the
+     * class <code>TimedLiteral</code> and both timed literals have the same
+     * time stamp and literal expression.
+     * 
+     * @param obj The reference object with which to compare.
+     * @return <code>true</code> if the timed literal equal to an other
+     *         object; <code>false</code> otherwise.
+     */
+    public boolean equals(Object obj) {
+        if (obj != null && this.getClass().equals(obj.getClass())) {
+            TimedLiteral other = (TimedLiteral) obj;
+            return super.equals(obj) && this.ts.equals(other.ts);
+        }
+        return false;
+    }
+
+    /**
+     * Returns a hash code value for the timed literal. 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 effect goal description.
+     */
+    public int hashCode() {
+        return super.hashCode() + this.ts.hashCode();
+    }
+
+    /**
+     * Creates and returns a copy of this expression.
+     * 
+     * @return a clone of this expression instance.
+     * @see pddl4j.exp.Exp#clone()
+     */
+    public TimedLiteral clone() {
+        TimedLiteral other = (TimedLiteral) super.clone();
+        other.ts = this.ts.clone();
+        return other;
+    }
+    
+    /**
+     * Returns a string representation of this "at start" timed expression.
+     * 
+     * @return a string representation of this "at start" timed expression.
+     */
+    public String toString() {
+        StringBuffer str = new StringBuffer();
+        str.append("(at ");
+        str.append(this.ts.toString());
+        str.append(" ");
+        str.append(this.getExp().toString());
+        str.append(")");
+        return str.toString();
+    }
+
+    /**
+     * Returns a typed string representation of this "at start" timed
+     * expression.
+     * 
+     * @return a typed string representation of this "at start" timed
+     *         expression.
+     */
+    public String toTypedString() {
+        StringBuffer str = new StringBuffer();
+        str.append("(at ");
+        str.append(this.ts.toTypedString());
+        str.append(" ");
+        str.append(this.getExp().toTypedString());
+        str.append(")");
+        return str.toString();
+    }
+}