diff --git a/src/main/java/com/mysema/query/ExtQueryBase.java b/src/main/java/com/mysema/query/ExtQueryBase.java
new file mode 100644
index 000000000..625357cd6
--- /dev/null
+++ b/src/main/java/com/mysema/query/ExtQueryBase.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2008 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
+package com.mysema.query;
+
+import com.mysema.query.grammar.Types.BooleanExpr;
+import com.mysema.query.grammar.Types.EntityExpr;
+
+/**
+ * ExtQueryBased provides
+ *
+ * @author tiwe
+ * @version $Id$
+ */
+@SuppressWarnings("unchecked")
+public class ExtQueryBase<A extends ExtQueryBase<A>> extends QueryBase<A> implements ExtQuery<A> { 
+
+    public A innerJoin(EntityExpr<?> object) {
+        joins.add(new JoinExpression(JoinType.IJ,object));
+        return (A) this;
+    }
+    
+    public A join(EntityExpr<?> object) {
+        joins.add(new JoinExpression(JoinType.J,object));
+        return (A) this;
+    }
+
+    public A leftJoin(EntityExpr<?> object) {
+        joins.add(new JoinExpression(JoinType.LJ,object));
+        return (A) this;
+    }
+    
+    public A with(BooleanExpr... objects) {
+        if (!joins.isEmpty()){
+            joins.get(joins.size()-1).conditions = objects;
+        }
+        return (A) this;
+    }
+}
diff --git a/src/main/java/com/mysema/query/QueryBase.java b/src/main/java/com/mysema/query/QueryBase.java
index 4f5322716..a124b0554 100644
--- a/src/main/java/com/mysema/query/QueryBase.java
+++ b/src/main/java/com/mysema/query/QueryBase.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2008 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
 package com.mysema.query;
 
 import java.util.ArrayList;
@@ -14,7 +19,7 @@ import com.mysema.query.grammar.Types.OrderSpecifier;
  * @version $Id$
  */
 @SuppressWarnings("unchecked")
-public class QueryBase<A extends QueryBase<A>> implements ExtQuery<A> {
+public class QueryBase<A extends QueryBase<A>> implements Query<A> {
     public enum JoinType{
         DEFAULT,IJ,LJ,J
     }
@@ -35,7 +40,6 @@ public class QueryBase<A extends QueryBase<A>> implements ExtQuery<A> {
     protected OrderSpecifier<?>[] orderBy;
     protected Expr<?>[] select;
     protected BooleanExpr[] where;
-    protected BooleanExpr[] with;
     
     protected void clear(){
         joins.clear();
@@ -47,7 +51,9 @@ public class QueryBase<A extends QueryBase<A>> implements ExtQuery<A> {
     }
     
     public A from(EntityExpr<?>... objects) {
-        // TODO
+        for (EntityExpr<?> expr : objects){
+            joins.add(new JoinExpression(JoinType.DEFAULT,expr));
+        }
         return (A) this;
     }
 
@@ -61,20 +67,6 @@ public class QueryBase<A extends QueryBase<A>> implements ExtQuery<A> {
         return (A) this;
     }
 
-    public A innerJoin(EntityExpr<?> object) {
-//        innerJoin = objects;
-        return (A) this;
-    }
-    
-    public A join(EntityExpr<?> object) {
-//        join = objects;
-        return (A) this;
-    }
-
-    public A leftJoin(EntityExpr<?> object) {
-//        leftJoin = objects;
-        return (A) this;
-    }
 
     public A orderBy(OrderSpecifier<?>... objects) {
         orderBy = objects;
@@ -91,9 +83,4 @@ public class QueryBase<A extends QueryBase<A>> implements ExtQuery<A> {
         return (A) this;
     }
     
-    public A with(BooleanExpr... objects) {
-        with = objects;
-        return (A) this;
-    }
-
 }
diff --git a/src/main/java/com/mysema/query/grammar/Grammar.java b/src/main/java/com/mysema/query/grammar/Grammar.java
index 267865b3a..e35783bb4 100644
--- a/src/main/java/com/mysema/query/grammar/Grammar.java
+++ b/src/main/java/com/mysema/query/grammar/Grammar.java
@@ -121,6 +121,10 @@ public class Grammar {
     public static <D> EntityExpr<D> as(DomainType<D> from, DomainType<D> to) {
         return new Alias<D>(from, to);
     }
+    
+    public static <D> EntityExpr<D> as(CollectionReference<D> from, DomainType<D> to) {
+        return new CollectionAlias<D>(from, to);
+    }
 
     public static <A extends Comparable<A>> OrderSpecifier<A> asc(Expr<A> target) {
         return _orderAsc(target);
diff --git a/src/main/java/com/mysema/query/grammar/Types.java b/src/main/java/com/mysema/query/grammar/Types.java
index 18411b840..6a7354cde 100644
--- a/src/main/java/com/mysema/query/grammar/Types.java
+++ b/src/main/java/com/mysema/query/grammar/Types.java
@@ -5,6 +5,9 @@
  */
 package com.mysema.query.grammar;
 
+import java.util.Collection;
+
+
 /**
  * Types provides the types of the fluent grammar
  *
@@ -32,8 +35,8 @@ public class Types {
          * arguments don't need to be of same type as return type
          */
         public Expr<L> left;
-        public Expr<R> right; 
         public Op<OP> operator; 
+        public Expr<R> right; 
     }
     
     /**
@@ -47,7 +50,7 @@ public class Types {
     public static class BooleanProperty extends Reference<Boolean> implements BooleanExpr{
         public BooleanProperty(String path) {super(path);}
     }
-        
+    
     /**
      * Boolean operators (operators used with boolean operands)
      */
@@ -58,9 +61,26 @@ public class Types {
         BoOp<Boolean> XNOR = new BoOpImpl<Boolean>();
         BoOp<Boolean> XOR = new BoOpImpl<Boolean>();
     }
-    
+        
     static class BoOpImpl<RT> implements BoOp<RT>{}
+    
+    public static class CollectionAlias<D> extends Reference<D> implements EntityExpr<D>{
+        public final CollectionReference<D> from;
+        public final Reference<D> to;
+        CollectionAlias(CollectionReference<D> from, Reference<D> to) {
+            super(to.toString());
+            this.from = from;
+            this.to = to;
+        }        
+    }
        
+    public static class CollectionReference<A> extends Reference<Collection<A>> implements 
+        EntityExpr<Collection<A>>{
+        public CollectionReference(String p) {
+            super(p);
+        }        
+    }
+    
     /**
      * Operators for Comparable objects
      */
@@ -70,10 +90,10 @@ public class Types {
         CompOp<Boolean> GT = new CompOpImpl<Boolean>();
         CompOp<Boolean> LOE = new CompOpImpl<Boolean>();
         CompOp<Boolean> LT = new CompOpImpl<Boolean>();
-    }
-    
-    static class CompOpImpl<RT> implements CompOp<RT> {}    
+    }    
         
+    static class CompOpImpl<RT> implements CompOp<RT> {}
+    
     public static class ConstantExpr<A> implements Expr<A>{
         public A constant;
     }
@@ -96,6 +116,9 @@ public class Types {
         protected BooleanProperty _boolean(String path){
             return new BooleanProperty(this+"."+path);
         }
+        protected <A>CollectionReference<A> _collection(String path,Class<A> type) {
+            return new CollectionReference<A>(this+"."+path);
+        }
         protected <A> Reference<A> _prop(String path,Class<A> type) {
             return new Reference<A>(this+"."+path);
         }
@@ -126,11 +149,11 @@ public class Types {
      */
     public interface Op<RT> {
         Op<Boolean> EQ = new OpImpl<Boolean>();
+        Op<Boolean> IN = new OpImpl<Boolean>();
+        Op<Boolean> ISNOTNULL = new OpImpl<Boolean>();
+        Op<Boolean> ISNULL = new OpImpl<Boolean>();
         Op<Boolean> ISTYPEOF = new OpImpl<Boolean>();
         Op<Boolean> NE = new OpImpl<Boolean>();
-        Op<Boolean> IN = new OpImpl<Boolean>();
-        Op<Boolean> ISNULL = new OpImpl<Boolean>();
-        Op<Boolean> ISNOTNULL = new OpImpl<Boolean>();
     }
     
     public interface Operation<RT> extends Expr<RT> {}
@@ -177,9 +200,9 @@ public class Types {
          * arguments don't need to be of same type as return type
          */
         public Expr<F> first;
+        public Op<OP> operator;
         public Expr<S> second;
-        public Expr<T> third;
-        public Op<OP> operator; 
+        public Expr<T> third; 
     }
     
     public static class UnaryBooleanOperation<A> extends UnaryOperation<Boolean,Boolean,A>
diff --git a/src/main/java/com/mysema/query/grammar/Visitor.java b/src/main/java/com/mysema/query/grammar/Visitor.java
index 778a24f12..62d7f806b 100644
--- a/src/main/java/com/mysema/query/grammar/Visitor.java
+++ b/src/main/java/com/mysema/query/grammar/Visitor.java
@@ -64,6 +64,10 @@ public abstract class Visitor<T extends Visitor<T>> {
     
     protected abstract void visit(BooleanProperty expr);
     
+    protected abstract void visit(CollectionAlias<?> expr);
+    
+    protected abstract void visit(CollectionReference<?> expr);
+    
     protected abstract void visit(ConstantExpr<?> expr);
     
     protected abstract void visit(DomainType<?> expr);
diff --git a/src/main/java/com/mysema/query/grammar/VisitorAdapter.java b/src/main/java/com/mysema/query/grammar/VisitorAdapter.java
index fd717a52f..796bb9f8a 100644
--- a/src/main/java/com/mysema/query/grammar/VisitorAdapter.java
+++ b/src/main/java/com/mysema/query/grammar/VisitorAdapter.java
@@ -25,6 +25,16 @@ public abstract class VisitorAdapter<V extends VisitorAdapter<V>> extends Visito
         visit((Reference<?>)expr);     
     }
     
+    @Override
+    protected void visit(CollectionAlias<?> expr){
+        visit((Reference<?>)expr);
+    }
+    
+    @Override
+    protected void visit(CollectionReference<?> expr){
+        visit((Reference<?>)expr);
+    }
+    
     @Override
     protected void visit(DomainType<?> expr) {
         visit((Reference<?>)expr);