diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/APTModelFactory.java b/querydsl-apt/src/main/java/com/mysema/query/apt/APTModelFactory.java
index 7dcdf8d03..63aca3c83 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/APTModelFactory.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/APTModelFactory.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 import java.lang.annotation.Annotation;
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/Configuration.java b/querydsl-apt/src/main/java/com/mysema/query/apt/Configuration.java
index 9f085c5c0..74e271364 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/Configuration.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/Configuration.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 import java.lang.annotation.Annotation;
@@ -39,7 +44,8 @@ public class Configuration {
     }
     
     public boolean isValidConstructor(ExecutableElement constructor) {
-        return constructor.getModifiers().contains(Modifier.PUBLIC);
+        return constructor.getModifiers().contains(Modifier.PUBLIC)
+            && !constructor.getParameters().isEmpty();
     }
     
     public boolean isValidField(VariableElement field) {
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/DTOElementVisitor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/DTOElementVisitor.java
index a7b3910c7..5c86b344d 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/DTOElementVisitor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/DTOElementVisitor.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 import java.util.ArrayList;
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/EntityElementVisitor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/EntityElementVisitor.java
index 7d7ceaaec..d176d482f 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/EntityElementVisitor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/EntityElementVisitor.java
@@ -1,6 +1,16 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 import javax.annotation.processing.ProcessingEnvironment;
 import javax.lang.model.element.Element;
@@ -17,7 +27,9 @@ import org.apache.commons.lang.StringUtils;
 
 import com.mysema.query.annotations.QueryType;
 import com.mysema.query.codegen.ClassModel;
+import com.mysema.query.codegen.ConstructorModel;
 import com.mysema.query.codegen.FieldModel;
+import com.mysema.query.codegen.ParameterModel;
 import com.mysema.query.codegen.TypeCategory;
 import com.mysema.query.codegen.TypeModel;
 
@@ -51,7 +63,57 @@ public final class EntityElementVisitor extends SimpleElementVisitor6<ClassModel
         ClassModel classModel = new ClassModel(namePrefix, sc.getName(), c.getPackageName(), c.getName(), c.getSimpleName());
         List<? extends Element> elements = e.getEnclosedElements();
     
+        // CONSTRUCTORS
+        
+        for (ExecutableElement constructor : ElementFilter.constructorsIn(elements)){
+            if (configuration.isValidConstructor(constructor)){
+                List<ParameterModel> parameters = new ArrayList<ParameterModel>(constructor.getParameters().size());
+                for (VariableElement var : constructor.getParameters()){
+                    TypeModel varType = typeFactory.create(var.asType(), elementUtils);
+                    parameters.add(new ParameterModel(var.getSimpleName().toString(), varType.getName()));
+                }
+                classModel.addConstructor(new ConstructorModel(parameters));    
+            }                
+        }  
+
         VisitorConfig config = configuration.getConfig(e, elements);
+                
+        Set<String> blockedFields = new HashSet<String>();
+        Map<String,FieldModel> fields = new HashMap<String,FieldModel>();
+        Map<String,TypeCategory> types = new HashMap<String,TypeCategory>();
+        
+        // FIELDS
+        
+        if (config.isVisitFields()){
+            for (VariableElement field : ElementFilter.fieldsIn(elements)){
+                String name = field.getSimpleName().toString();
+                if (configuration.isValidField(field)){
+                    try{                        
+                        TypeModel typeModel = typeFactory.create(field.asType(), elementUtils);                            
+                        if (field.getAnnotation(QueryType.class) != null){
+                            TypeCategory typeCategory = TypeCategory.get(field.getAnnotation(QueryType.class).value());
+                            if (typeCategory == null){
+                                blockedFields.add(name);
+                                continue;
+                            }
+                            typeModel = typeModel.as(typeCategory);
+                            types.put(name, typeCategory);
+                        }                        
+                        fields.put(name, new FieldModel(classModel, name, typeModel, null));    
+                    }catch(IllegalArgumentException ex){
+                        StringBuilder builder = new StringBuilder();
+                        builder.append("Caught exception for field ");
+                        builder.append(c.getName()).append("#").append(field.getSimpleName());
+                        throw new RuntimeException(builder.toString(), ex);
+                    }
+                        
+                }else{
+                    blockedFields.add(name);
+                }
+            }    
+        }
+        
+        // METHODS
         
         if (config.isVisitMethods()){
             for (ExecutableElement method : ElementFilter.methodsIn(elements)){
@@ -67,13 +129,18 @@ public final class EntityElementVisitor extends SimpleElementVisitor6<ClassModel
                     try{
                         TypeModel typeModel = typeFactory.create(method.getReturnType(), elementUtils);
                         if (method.getAnnotation(QueryType.class) != null){
-                            TypeCategory category = TypeCategory.get(method.getAnnotation(QueryType.class).value());
-                            if (category == null){
+                            TypeCategory typeCategory = TypeCategory.get(method.getAnnotation(QueryType.class).value());
+                            if (typeCategory == null){
+                                blockedFields.add(name);
+                                continue;
+                            }else if (blockedFields.contains(name)){
                                 continue;
                             }
-                            typeModel = typeModel.as(category);
+                            typeModel = typeModel.as(typeCategory);
+                        }else if (types.containsKey(name)){
+                            typeModel = typeModel.as(types.get(name));
                         }
-                        classModel.addField(new FieldModel(classModel, name, typeModel, null));    
+                        fields.put(name, new FieldModel(classModel, name, typeModel, null));    
                         
                     }catch(IllegalArgumentException ex){
                         StringBuilder builder = new StringBuilder();
@@ -81,35 +148,18 @@ public final class EntityElementVisitor extends SimpleElementVisitor6<ClassModel
                         builder.append(c.getName()).append("#").append(method.getSimpleName());
                         throw new RuntimeException(builder.toString(), ex);
                     }
-                }                
+                }else{
+                    blockedFields.add(name);
+                }
             }   
         }
+               
         
-        
-        if (config.isVisitFields()){
-            for (VariableElement field : ElementFilter.fieldsIn(elements)){
-                if (configuration.isValidField(field)){
-                    try{
-                        TypeModel typeModel = typeFactory.create(field.asType(), elementUtils);     
-                        if (field.getAnnotation(QueryType.class) != null){
-                            TypeCategory category = TypeCategory.get(field.getAnnotation(QueryType.class).value());
-                            if (category == null){
-                                continue;
-                            }
-                            typeModel = typeModel.as(category);
-                        }
-                        String name = field.getSimpleName().toString();
-                        classModel.addField(new FieldModel(classModel, name, typeModel, null));    
-                    }catch(IllegalArgumentException ex){
-                        StringBuilder builder = new StringBuilder();
-                        builder.append("Caught exception for field ");
-                        builder.append(c.getName()).append("#").append(field.getSimpleName());
-                        throw new RuntimeException(builder.toString(), ex);
-                    }
-                        
-                }                
-            }    
-        }
+        for (Map.Entry<String,FieldModel> entry : fields.entrySet()){
+            if (!blockedFields.contains(entry.getKey())){
+                classModel.addField(entry.getValue());
+            }
+        }        
         
         return classModel;
     }
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/Processor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/Processor.java
index 0cd9d45b3..32c79f982 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/Processor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/Processor.java
@@ -35,7 +35,6 @@ import com.mysema.query.codegen.TypeModelFactory;
  * @author tiwe
  * 
  */
-// TODO : simplify this
 @Immutable
 public class Processor {
     
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/TypeArgumentsException.java b/querydsl-apt/src/main/java/com/mysema/query/apt/TypeArgumentsException.java
index 7fe612baf..4e609b2be 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/TypeArgumentsException.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/TypeArgumentsException.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 /**
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/UnsupportedTypeException.java b/querydsl-apt/src/main/java/com/mysema/query/apt/UnsupportedTypeException.java
index 0eafc319e..34c2f855c 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/UnsupportedTypeException.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/UnsupportedTypeException.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 import javax.lang.model.type.TypeMirror;
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/VisitorConfig.java b/querydsl-apt/src/main/java/com/mysema/query/apt/VisitorConfig.java
index e6016bbbc..b9681e66d 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/VisitorConfig.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/VisitorConfig.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt;
 
 /**
@@ -33,5 +38,4 @@ public enum VisitorConfig {
         return methods;
     }
     
-    
 }
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/jdo/JDOAnnotationProcessor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/jdo/JDOAnnotationProcessor.java
index c20ed1162..5ab00175f 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/jdo/JDOAnnotationProcessor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/jdo/JDOAnnotationProcessor.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt.jdo;
 
 import java.lang.annotation.Annotation;
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAAnnotationProcessor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAAnnotationProcessor.java
index 28ff11899..5537f47f7 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAAnnotationProcessor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAAnnotationProcessor.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt.jpa;
 
 import java.lang.annotation.Annotation;
diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAConfiguration.java b/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAConfiguration.java
index 400000c11..00cc6769c 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAConfiguration.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/jpa/JPAConfiguration.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query.apt.jpa;
 
 import java.lang.annotation.Annotation;
diff --git a/querydsl-collections/src/main/java/com/mysema/query/collections/ColQueryTemplates.java b/querydsl-collections/src/main/java/com/mysema/query/collections/ColQueryTemplates.java
index be10a2e6c..d24b1ddcb 100644
--- a/querydsl-collections/src/main/java/com/mysema/query/collections/ColQueryTemplates.java
+++ b/querydsl-collections/src/main/java/com/mysema/query/collections/ColQueryTemplates.java
@@ -30,7 +30,6 @@ public class ColQueryTemplates extends JavaTemplates {
         add(Ops.AOE, "{0}.compareTo({1}) >= 0");
         add(Ops.BOE, "{0}.compareTo({1}) <= 0");
         add(Ops.BETWEEN, functions + ".between({0},{1},{2})");
-//        add(Ops.BETWEEN, "{0}.compareTo({1}) > 0 && {0}.compareTo({2}) < 0");
         add(Ops.STRING_CAST, "String.valueOf({0})");
         
         // Date and Time
@@ -60,6 +59,7 @@ public class ColQueryTemplates extends JavaTemplates {
     }
     
     public static boolean like(String str, String like){
+        // TODO : better escaping
         return str.matches(like.replace("%", ".*").replace('_', '.'));
     }
 
diff --git a/querydsl-collections/src/test/java/com/mysema/query/collections/domain/Cat.java b/querydsl-collections/src/test/java/com/mysema/query/collections/domain/Cat.java
index b64eb8177..ab95149a4 100644
--- a/querydsl-collections/src/test/java/com/mysema/query/collections/domain/Cat.java
+++ b/querydsl-collections/src/test/java/com/mysema/query/collections/domain/Cat.java
@@ -32,11 +32,9 @@ public class Cat extends Animal {
     
     private Cat mate;
     
-    @SuppressWarnings("unused")
     @QueryType(PropertyType.NONE)    
     private String skippedField;
     
-    @SuppressWarnings("unused")
     @QueryType(PropertyType.SIMPLE)    
     private String stringAsSimple;
 
@@ -106,9 +104,13 @@ public class Cat extends Animal {
         this.mate = mate;
     }
 
-//    public String getStringAsSimple() {
-//        return stringAsSimple;
-//    }
+    public String getStringAsSimple() {
+        return stringAsSimple;
+    }
+    
+    public String getSkippedField() {
+        return skippedField;
+    }
 
     public void setStringAsSimple(String stringAsSimple) {
         this.stringAsSimple = stringAsSimple;
diff --git a/querydsl-core/src/main/java/com/mysema/query/codegen/EmbeddableSerializer.java b/querydsl-core/src/main/java/com/mysema/query/codegen/EmbeddableSerializer.java
index b927acf94..e35dcf690 100644
--- a/querydsl-core/src/main/java/com/mysema/query/codegen/EmbeddableSerializer.java
+++ b/querydsl-core/src/main/java/com/mysema/query/codegen/EmbeddableSerializer.java
@@ -5,18 +5,31 @@
  */
 package com.mysema.query.codegen;
 
+import java.io.Writer;
+
 
 public class EmbeddableSerializer extends EntitySerializer{
     
-    @Override
-    protected void introDefaultInstance(StringBuilder builder, ClassModel model) {
-        // no default instance
-    }
-    
     @Override
     protected void constructorsForVariables(StringBuilder builder, ClassModel model) {
         // no root constructors
     }
+    
+    @Override
+    protected void factoryMethods(ClassModel model, Writer writer) {
+        // no factory methods        
+    }
+    
+    @Override
+    protected void introImports(StringBuilder builder) {
+        builder.append("import com.mysema.query.util.*;\n");
+        builder.append("import com.mysema.query.types.path.*;\n\n");
+    }
+    
+    @Override
+    protected void introDefaultInstance(StringBuilder builder, ClassModel model) {
+        // no default instance
+    }
 
 
 }
diff --git a/querydsl-core/src/main/java/com/mysema/query/codegen/EntitySerializer.java b/querydsl-core/src/main/java/com/mysema/query/codegen/EntitySerializer.java
index 8e925de44..6c57fe019 100644
--- a/querydsl-core/src/main/java/com/mysema/query/codegen/EntitySerializer.java
+++ b/querydsl-core/src/main/java/com/mysema/query/codegen/EntitySerializer.java
@@ -17,6 +17,9 @@ public class EntitySerializer implements Serializer{
         // intro
         intro(model, writer);
         
+        // factory methods
+        factoryMethods(model, writer);        
+        
         // fields
         for (FieldModel field : model.getStringFields()){
             stringField(field, writer);
@@ -88,6 +91,38 @@ public class EntitySerializer implements Serializer{
         outro(model, writer);
     }
         
+    protected void factoryMethods(ClassModel model, Writer writer) throws IOException {
+        final String localName = model.getLocalName();
+        
+        StringBuilder builder = new StringBuilder();
+        for (ConstructorModel c : model.getConstructors()){
+            // begin
+            builder.append("    /**\n");
+            builder.append("     * Factory method for projection\n");
+            builder.append("     */\n");
+            builder.append("    public static EConstructor<" + localName + "> create(");
+            boolean first = true;
+            for (ParameterModel p : c.getParameters()){
+                if (!first) builder.append(", ");
+                builder.append("Expr<" + p.getTypeName() + "> " + p.getName());
+                first = false;
+            }
+            builder.append("){\n");
+            
+            // body
+            builder.append("        return new EConstructor<" + localName + ">(" + localName + ".class");
+            for (ParameterModel p : c.getParameters()){
+                builder.append(", " + p.getName());
+            }
+            
+            // end
+            builder.append(");\n");
+            builder.append("    }\n\n");
+        }
+        writer.append(builder.toString());
+        
+    }
+
     protected void booleanField(FieldModel field, Writer writer) throws IOException {
         serialize(field, "PBoolean", writer, "createBoolean");
     }
@@ -155,6 +190,9 @@ public class EntitySerializer implements Serializer{
         final String escapedName = field.getEscapedName();
         final String queryType = field.getQueryTypeName();               
         StringBuilder builder = new StringBuilder();
+        builder.append("    /**\n");
+        builder.append("     * Lazy creation of "+fieldName+" field\n");
+        builder.append("     */\n");
         builder.append("    public " + queryType + " _" + fieldName + "() {\n");
         builder.append("        if (" + escapedName + " == null){\n");
         builder.append("            " + escapedName + " = new " + queryType + "(PathMetadata.forProperty(this,\"" + fieldName + "\"));\n");
@@ -180,6 +218,9 @@ public class EntitySerializer implements Serializer{
             ClassModel _super = model.getSuperModel();
             final String simpleName = _super.getSimpleName();
             final String queryType = _super.getPrefix() + simpleName;
+            builder.append("    /**\n");
+            builder.append("     * Reference to the same path with the supertype signature\n");
+            builder.append("     */\n");
             builder.append("    public final "+queryType+" _super = new " + queryType + "(this);\n\n");
         }        
     }
@@ -200,7 +241,8 @@ public class EntitySerializer implements Serializer{
 
     protected void introImports(StringBuilder builder) {
         builder.append("import com.mysema.query.util.*;\n");
-        builder.append("import com.mysema.query.types.path.*;\n\n");
+        builder.append("import com.mysema.query.types.path.*;\n");
+        builder.append("import com.mysema.query.types.expr.*;\n");
     }
 
     protected void introJavadoc(StringBuilder builder, ClassModel model) {
diff --git a/querydsl-core/src/main/java/com/mysema/query/codegen/SupertypeSerializer.java b/querydsl-core/src/main/java/com/mysema/query/codegen/SupertypeSerializer.java
index 25b3d4489..f8d760daf 100644
--- a/querydsl-core/src/main/java/com/mysema/query/codegen/SupertypeSerializer.java
+++ b/querydsl-core/src/main/java/com/mysema/query/codegen/SupertypeSerializer.java
@@ -22,6 +22,17 @@ public class SupertypeSerializer extends EntitySerializer{
         // no default instance
     }
     
+    @Override
+    protected void factoryMethods(ClassModel model, Writer writer) {
+        // no factory methods        
+    }
+    
+    @Override
+    protected void introImports(StringBuilder builder) {
+        builder.append("import com.mysema.query.util.*;\n");
+        builder.append("import com.mysema.query.types.path.*;\n\n");
+    }
+    
     @Override
     protected void constructors(ClassModel model, Writer writer) throws IOException {
         final String simpleName = model.getSimpleName();
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/TemplateFactory.java b/querydsl-core/src/main/java/com/mysema/query/types/TemplateFactory.java
index 2925b06c0..63ba7b6a9 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/TemplateFactory.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/TemplateFactory.java
@@ -15,6 +15,7 @@ import java.util.regex.Pattern;
 import net.jcip.annotations.Immutable;
 
 import com.mysema.query.types.Template.Element;
+import com.mysema.query.types.expr.Constant;
 import com.mysema.query.types.expr.EString;
 
 /**
@@ -43,26 +44,38 @@ public class TemplateFactory {
     private final Converter<EString,EString> toStartsWithViaLike = new Converter<EString,EString>(){
         @Override
         public EString convert(EString arg) {
-            return arg.append("%");
+            return escapeForLike(arg).append("%");
         } 
     };
     
     private final Converter<EString,EString> toEndsWithViaLike = new Converter<EString,EString>(){
         @Override
         public EString convert(EString arg) {
-            return arg.prepend("%");
+            return escapeForLike(arg).prepend("%");
         } 
     };
     
     private final Converter<EString,EString> toContainsViaLike = new Converter<EString,EString>(){
         @Override
         public EString convert(EString arg) {
-            return arg.prepend("%").append("%");
+            return escapeForLike(arg).prepend("%").append("%");
         }
     };
     
     private final Map<String,Template> cache = new HashMap<String,Template>();
     
+    @SuppressWarnings("unchecked")
+    private EString escapeForLike(EString expr){
+        if (expr instanceof Constant){
+            String str = ((Constant<String>) expr).getConstant();
+            if (str.contains("%") || str.contains("_")){
+                str = str.replace("%", "\\%").replace("_", "\\_");
+                return EString.create(str);
+            }                
+        }        
+        return expr;
+    }
+    
     public Template create(String template){
         if (cache.containsKey(template)){
             return cache.get(template);
diff --git a/querydsl-hql/src/main/java/com/mysema/query/hql/HQLTemplates.java b/querydsl-hql/src/main/java/com/mysema/query/hql/HQLTemplates.java
index 427c6b97e..8f5eb1553 100644
--- a/querydsl-hql/src/main/java/com/mysema/query/hql/HQLTemplates.java
+++ b/querydsl-hql/src/main/java/com/mysema/query/hql/HQLTemplates.java
@@ -59,7 +59,7 @@ public class HQLTemplates extends Templates {
         
         // string
         add(Ops.CONCAT, "{0} || {1}", 37);
-        add(Ops.MATCHES, "{0} like {1}", 27); // TODO : as real regex
+        add(Ops.MATCHES, "{0} like {1}", 27); // TODO : support real regexes 
         add(Ops.LOWER, "lower({0})");
         add(Ops.SUBSTR_1ARG, "substring({0},{1})");
         add(Ops.SUBSTR_2ARGS, "substring({0},{1},{2})");