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diff --git a/test/uk/ac/ox/cs/pagoda/approx/ApproxTester.java b/test/uk/ac/ox/cs/pagoda/approx/ApproxTester.java
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+package uk.ac.ox.cs.pagoda.approx;
+
+import java.io.IOException;
+
+import org.semanticweb.owlapi.model.OWLOntology;
+
+import uk.ac.ox.cs.pagoda.approx.KnowledgeBase;
+import uk.ac.ox.cs.pagoda.approx.RLOntology;
+import uk.ac.ox.cs.pagoda.approx.RLPlusOntology;
+import uk.ac.ox.cs.pagoda.constraints.NullaryBottom;
+import uk.ac.ox.cs.pagoda.owl.OWLHelper;
+import uk.ac.ox.cs.pagoda.rules.DisjunctiveProgram;
+import uk.ac.ox.cs.pagoda.rules.ExistentialProgram;
+import uk.ac.ox.cs.pagoda.rules.ExistentialToDisjunctive;
+import uk.ac.ox.cs.pagoda.rules.GeneralProgram;
+import uk.ac.ox.cs.pagoda.rules.LowerDatalogProgram;
+import uk.ac.ox.cs.pagoda.rules.UpperDatalogProgram;
+import uk.ac.ox.cs.pagoda.util.Utility;
+
+public class ApproxTester {
+        
+        private static ApproxType description = ApproxType.DATALOGPMOR; 
+        
+        private static String ontoFile = null;
+        
+        public static void main(String[] args) throws IOException
+        {
+                args = new String[] {
+                                "-tbox", 
+//                              "/home/yzhou/krr-nas-share/Yujiao/ontologies/bio2rdf/chembl/cco-noDPR.ttl", 
+//                              "/home/yzhou/krr-nas-share/Yujiao/ontologies/bio2rdf/reactome/biopax-level3-processed.owl", 
+//                              "/media/krr-nas-share/Yujiao/ontologies/bio2rdf/atlas/gxaterms.owl", 
+//                              "/media/krr-nas-share/Yujiao/ontologies/bio2rdf/uniprot/core-sat-processed.owl",
+//                              PagodaTester.npd_tbox,
+//                              "/users/yzhou/temp/ontologies/core.RLor.rdf",
+                                "datatype.owl", 
+                                "-dest", ApproxType.DATALOGPMOR.toString() 
+                }; 
+
+                long startTime = System.currentTimeMillis();
+                
+                if (args.length > 0) {
+                        if (args.length % 2 != 0) {
+                                System.out.println("arguments error..."); 
+                                return ;
+                        }
+                        for (int i = 0; i < args.length ; i = i + 2) 
+                                if (!setArgument(args[i], args[i + 1])) {
+                                        System.out.println("arguments error..."); 
+                                        return ;
+                                }
+                }
+                
+//              Utility.redirectSystemOut();
+                
+                System.setProperty("entityExpansionLimit", String.valueOf(Integer.MAX_VALUE));
+                
+                String directory = ontoFile.substring(0, ontoFile.lastIndexOf(Utility.FILE_SEPARATOR) + 1); 
+                
+                KnowledgeBase program = null;
+                switch (description) {
+                case OWL2RLPLUS: program = new RLPlusOntology(); break; 
+                case OWL2RL: program = new RLOntology(); break;
+                case DATALOG_UPPER: program = new UpperDatalogProgram(); break; 
+                case DATALOG_LOWER: program = new LowerDatalogProgram(); break; 
+                case EXISTENTIAL: program = new ExistentialProgram(); break;
+                case DISJUNCTIVE: program = new DisjunctiveProgram(); break;  
+                case DATALOGPMOR: program = new GeneralProgram(); break;
+                case EXIST2DISJ: program = new ExistentialToDisjunctive(); break;
+                default: 
+                        System.exit(0);
+                }
+
+                if (program instanceof RLPlusOntology)
+                        ((RLPlusOntology) program).setCorrespondenceFileLoc(directory + "correspondence");
+                OWLOntology ontology = OWLHelper.loadOntology(ontoFile);  
+                program.load(ontology, new NullaryBottom());
+
+                program.transform();
+
+                program.save();
+                
+                System.out.println("Time to transform the rules: " + (System.currentTimeMillis() - startTime) / 1000.);
+                
+                Utility.closeCurrentOut();
+        }
+
+        private static boolean setArgument(String key, String value) {
+                if (key.equalsIgnoreCase("-dest")) 
+                        if (value.equalsIgnoreCase("OWL2RL+")) description = ApproxType.OWL2RLPLUS;
+                        else if (value.equalsIgnoreCase("OWL2RL")) description = ApproxType.OWL2RL; 
+                        else if (value.equalsIgnoreCase("UPPERDATALOG")) description = ApproxType.DATALOG_UPPER;
+                        else if (value.equalsIgnoreCase("LOWERDATALOG")) description = ApproxType.DATALOG_LOWER;
+                        else if (value.equalsIgnoreCase("DATALOGPMOR")) description = ApproxType.DATALOGPMOR;
+                        else if (value.equalsIgnoreCase("EXISTENTIALRULES")) description = ApproxType.EXISTENTIAL;
+                        else if (value.equalsIgnoreCase("DISJUNCTIVE")) description = ApproxType.DISJUNCTIVE;
+                        else if (value.equalsIgnoreCase("EXIST2DISJ")) description = ApproxType.EXIST2DISJ; 
+                        else {
+                                System.out.println("illegal destination argument..."); 
+                                return false;
+                        }
+                else if (key.equalsIgnoreCase("-tbox")) 
+                        ontoFile = value;
+                else {
+                        System.out.println("unrecognisable type of argument..."); 
+                        return false;
+                }
+                
+                return true;
+        }
+        
+        public enum ApproxType {
+                /**
+                 * approx to (RL + self + top being the subClassExp)
+                 */
+                OWL2RLPLUS,     
+                
+                /**
+                 * approx to RL
+                 */
+                OWL2RL,                 
+                
+                /**
+                 * approx to datalog by replacing existential quantified variables 
+                 * by fresh constants and replacing disjunctions by conjunctions
+                 */
+                DATALOG_UPPER,          
+                
+                /**
+                 * approx to datalog by ignoring existential and disjunctive axiom
+                 */
+                DATALOG_LOWER,          
+                
+                /**
+                 * approx to existential rules by replacing disjunctions by 
+                 * conjunctions
+                 */
+                EXISTENTIAL,
+                
+                /**
+                 * approx to disjunctive datalog program by replacing existential 
+                 * quantified variables by fresh constants (DNF)
+                 */
+                DISJUNCTIVE, 
+                
+                /**
+                 * transform into rules, no approximation at all
+                 */
+                DATALOGPMOR,    
+                
+                /**
+                 * approx existential quantifiers by disjunctions
+                 */
+                EXIST2DISJ              
+
+        }; 
+        
+}