diff --git a/querydsl-core/src/main/java/com/mysema/query/serialization/OperationPatterns.java b/querydsl-core/src/main/java/com/mysema/query/serialization/OperationPatterns.java
index a365fa388..e0250c56f 100644
--- a/querydsl-core/src/main/java/com/mysema/query/serialization/OperationPatterns.java
+++ b/querydsl-core/src/main/java/com/mysema/query/serialization/OperationPatterns.java
@@ -139,6 +139,10 @@ public abstract class OperationPatterns {
         add(Ops.OpString.LTRIM, "ltrim(%s)");
         add(Ops.OpString.RTRIM, "rtrim(%s)");
         add(Ops.OpString.SPACE, "space(%s)");
+        
+        // collection
+        add(Ops.CONTAINS_KEY, "containsKey(%s,%s)");
+        add(Ops.CONTAINS_VALUE, "containsValue(%s,%s)");
 
         // path types
         for (PathType type : new PathType[] { PathMetadata.LISTVALUE,
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/Grammar.java b/querydsl-core/src/main/java/com/mysema/query/types/Grammar.java
index bbd46bb07..73cde7f44 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/Grammar.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/Grammar.java
@@ -23,6 +23,7 @@ import com.mysema.query.types.operation.Ops.OpNumberAgg;
 import com.mysema.query.types.path.PCollection;
 import com.mysema.query.types.path.PEntity;
 import com.mysema.query.types.path.PEntityCollection;
+import com.mysema.query.types.path.PMap;
 
 /**
  * Grammar provides the factory methods for the fluent grammar.
@@ -38,9 +39,6 @@ public class Grammar {
     protected static final OperationFactory operationFactory = SimpleOperationFactory
             .getInstance();
 
-    protected Grammar() {
-    };
-
     /**
      * Expr : left > right
      * 
@@ -54,20 +52,7 @@ public class Grammar {
         // types
         return operationFactory.createBoolean(Ops.AFTER, left, exprFactory
                 .createConstant(right));
-    }
-
-    /**
-     * Expr : left >= right (after or equals)
-     * 
-     * @param <A>
-     * @param left
-     * @param right
-     * @return
-     */
-    public static <A extends Comparable<?>> EBoolean aoe(Expr<A> left, A right) {
-        return operationFactory.createBoolean(Ops.AOE, left, exprFactory
-                .createConstant(right));
-    }
+    };
 
     /**
      * Expr : left > right
@@ -84,7 +69,31 @@ public class Grammar {
         // types
         return operationFactory.createBoolean(Ops.AFTER, left, right);
     }
-
+    
+    /**
+     * Expr : left and right
+     * 
+     * @param left
+     * @param right
+     * @return
+     */
+    public static EBoolean and(EBoolean left, EBoolean right) {
+        return operationFactory.createBoolean(Ops.AND, left, right);
+    }
+    
+    /**
+     * Expr : left >= right (after or equals)
+     * 
+     * @param <A>
+     * @param left
+     * @param right
+     * @return
+     */
+    public static <A extends Comparable<?>> EBoolean aoe(Expr<A> left, A right) {
+        return operationFactory.createBoolean(Ops.AOE, left, exprFactory
+                .createConstant(right));
+    }
+    
     /**
      * Expr : left >= right
      * 
@@ -97,18 +106,7 @@ public class Grammar {
             Expr<A> right) {
         return operationFactory.createBoolean(Ops.AOE, left, right);
     }
-
-    /**
-     * Expr : left and right
-     * 
-     * @param left
-     * @param right
-     * @return
-     */
-    public static EBoolean and(EBoolean left, EBoolean right) {
-        return operationFactory.createBoolean(Ops.AND, left, right);
-    }
-
+    
     /**
      * Expr : from as to
      * 
@@ -188,19 +186,6 @@ public class Grammar {
                 .createConstant(right));
     }
 
-    /**
-     * Expr : left <= right (before or equals)
-     * 
-     * @param <A>
-     * @param left
-     * @param right
-     * @return
-     */
-    public static <A extends Comparable<?>> EBoolean boe(Expr<A> left, A right) {
-        return operationFactory.createBoolean(Ops.BOE, left, exprFactory
-                .createConstant(right));
-    }
-
     /**
      * Expr : left < right
      * 
@@ -211,25 +196,11 @@ public class Grammar {
      */
     public static <A extends Comparable<?>> EBoolean before(Expr<A> left,
             Expr<A> right) {
-        // NOTE : signature is for Comparables to support other than Java's date
-        // types
+        // NOTE : signature is for Comparables to support other than Java's date types
         // NOTE : basically same as lt
         return operationFactory.createBoolean(Ops.BEFORE, left, right);
     }
 
-    /**
-     * Expr : left <= right
-     * 
-     * @param <A>
-     * @param left
-     * @param right
-     * @return
-     */
-    public static <A extends Comparable<?>> EBoolean boe(Expr<A> left,
-            Expr<A> right) {
-        return operationFactory.createBoolean(Ops.BOE, left, right);
-    }
-
     /**
      * Expr : left between start and end
      * 
@@ -259,6 +230,32 @@ public class Grammar {
         return operationFactory.createBoolean(Ops.BETWEEN, left, start, end);
     }
 
+    /**
+     * Expr : left <= right (before or equals)
+     * 
+     * @param <A>
+     * @param left
+     * @param right
+     * @return
+     */
+    public static <A extends Comparable<?>> EBoolean boe(Expr<A> left, A right) {
+        return operationFactory.createBoolean(Ops.BOE, left, exprFactory
+                .createConstant(right));
+    }
+
+    /**
+     * Expr : left <= right
+     * 
+     * @param <A>
+     * @param left
+     * @param right
+     * @return
+     */
+    public static <A extends Comparable<?>> EBoolean boe(Expr<A> left,
+            Expr<A> right) {
+        return operationFactory.createBoolean(Ops.BOE, left, right);
+    }
+
     /**
      * Expr : left.chartAt(right)
      * 
@@ -330,6 +327,50 @@ public class Grammar {
                 .createConstant(right));
     }
 
+    /**
+     * 
+     * @param <K>
+     * @param path
+     * @param key
+     * @return
+     */
+    public static <K> EBoolean containsKey(PMap<K,?> path, Expr<K> key){
+        return operationFactory.createBoolean(Ops.CONTAINS_KEY, (Expr<?>)path, key);
+    }
+
+    /**
+     * 
+     * @param <K>
+     * @param path
+     * @param key
+     * @return
+     */
+    public static <K> EBoolean containsKey(PMap<K,?> path, K key){
+        return operationFactory.createBoolean(Ops.CONTAINS_KEY, (Expr<?>)path, exprFactory.createConstant(key));
+    }
+
+    /**
+     * 
+     * @param <V>
+     * @param path
+     * @param value
+     * @return
+     */
+    public static <V> EBoolean containsValue(PMap<?,V> path, Expr<V> value){
+        return operationFactory.createBoolean(Ops.CONTAINS_VALUE, (Expr<?>)path, value);
+    }
+
+    /**
+     * 
+     * @param <V>
+     * @param path
+     * @param value
+     * @return
+     */
+    public static <V> EBoolean containsValue(PMap<?,V> path, V value){
+        return operationFactory.createBoolean(Ops.CONTAINS_VALUE, (Expr<?>)path, exprFactory.createConstant(value));
+    }
+
     /**
      * Expr : count(*)
      * 
@@ -371,11 +412,6 @@ public class Grammar {
                 (Expr<?>) collection);
     }
 
-    public static EBoolean notEmpty(PCollection<?> collection) {
-        return operationFactory.createBoolean(Ops.COL_ISNOTEMPTY,
-                (Expr<?>) collection);
-    }
-
     /**
      * Expr : left.endsWith(right)
      * 
@@ -556,19 +592,6 @@ public class Grammar {
                 .createConstant(left), (Expr<?>) right);
     }
 
-    /**
-     * Expr : left in right OR right contains left
-     * 
-     * @param <A>
-     * @param left
-     * @param right
-     * @return
-     */
-    public static <A> EBoolean in(Expr<A> left, Collection<? extends A> right) {
-        return operationFactory.createBoolean(Ops.IN, left, exprFactory
-                .createConstant(right));
-    }
-
     /**
      * Expr : left in rest OR rest contains left
      * 
@@ -582,6 +605,19 @@ public class Grammar {
                 .createConstant(rest));
     }
 
+    /**
+     * Expr : left in right OR right contains left
+     * 
+     * @param <A>
+     * @param left
+     * @param right
+     * @return
+     */
+    public static <A> EBoolean in(Expr<A> left, Collection<? extends A> right) {
+        return operationFactory.createBoolean(Ops.IN, left, exprFactory
+                .createConstant(right));
+    }
+
     /**
      * Expr : left in right OR right contains left
      * 
@@ -633,6 +669,21 @@ public class Grammar {
                         .createConstant(i));
     }
 
+    /**
+     * Expr : left instanceOf right
+     * 
+     * @param <A>
+     * @param <B>
+     * @param left
+     * @param right
+     * @return
+     */
+    public static <A, B extends A> EBoolean instanceOf(Expr<A> left,
+            Class<B> right) {
+        return operationFactory.createBoolean(Ops.ISTYPEOF, left, exprFactory
+                .createConstant(right));
+    }
+
     /**
      * Expr : left.isEmpty()
      * 
@@ -899,6 +950,11 @@ public class Grammar {
         return operationFactory.createBoolean(Ops.NOTBETWEEN, left, start, end);
     }
 
+    public static EBoolean notEmpty(PCollection<?> collection) {
+        return operationFactory.createBoolean(Ops.COL_ISNOTEMPTY,
+                (Expr<?>) collection);
+    }
+
     /**
      * Expr : left not in rest
      * 
@@ -945,16 +1001,6 @@ public class Grammar {
         }
     }
 
-    /**
-     * Expr : cast(source as String)
-     * 
-     * @param source
-     * @return
-     */
-    public static EString stringCast(EComparable<?> source) {
-        return operationFactory.createString(Ops.STRING_CAST, source);
-    }
-
     /**
      * Expr : left or right
      * 
@@ -1035,6 +1081,16 @@ public class Grammar {
         }
     }
 
+    /**
+     * Expr : cast(source as String)
+     * 
+     * @param source
+     * @return
+     */
+    public static EString stringCast(EComparable<?> source) {
+        return operationFactory.createString(Ops.STRING_CAST, source);
+    }
+
     /**
      * Expr : left.substring(right)
      * 
@@ -1072,21 +1128,6 @@ public class Grammar {
         return operationFactory.createString(Ops.TRIM, left);
     }
 
-    /**
-     * Expr : left instanceOf right
-     * 
-     * @param <A>
-     * @param <B>
-     * @param left
-     * @param right
-     * @return
-     */
-    public static <A, B extends A> EBoolean instanceOf(Expr<A> left,
-            Class<B> right) {
-        return operationFactory.createBoolean(Ops.ISTYPEOF, left, exprFactory
-                .createConstant(right));
-    }
-
     /**
      * Expr : left.toUpperCase()
      * 
@@ -1096,4 +1137,7 @@ public class Grammar {
     public static EString upper(Expr<String> left) {
         return operationFactory.createString(Ops.UPPER, left);
     }
+
+    protected Grammar() {
+    }
 }
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/operation/Ops.java b/querydsl-core/src/main/java/com/mysema/query/types/operation/Ops.java
index 2dde3767d..b5867f23f 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/operation/Ops.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/operation/Ops.java
@@ -18,7 +18,7 @@ import java.util.List;
  * @version $Id$
  */
 public interface Ops {
-
+    
     static List<Class<?>> Boolean_x_2 = unmodifiableList(Arrays.<Class<?>> asList(Boolean.class, Boolean.class));
 
     static List<Class<?>> Comparable_x_2 = unmodifiableList(Arrays.<Class<?>> asList(Comparable.class, Comparable.class));
@@ -122,6 +122,8 @@ public interface Ops {
     Op<Boolean> ENDSWITH = new Op<Boolean>(String_x_2);
     Op<Boolean> ENDSWITH_IC = new Op<Boolean>(String_x_2);
     Op<Boolean> CONTAINS = new Op<Boolean>(String_x_2);
+    Op<Boolean> CONTAINS_KEY = new Op<Boolean>(Object_x_2);
+    Op<Boolean> CONTAINS_VALUE = new Op<Boolean>(Object_x_2);
 
     // subquery operations
     Op<Boolean> EXISTS = new Op<Boolean>(Object.class);
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/path/PComponentMap.java b/querydsl-core/src/main/java/com/mysema/query/types/path/PComponentMap.java
index e845906d3..7667a6f94 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/path/PComponentMap.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/path/PComponentMap.java
@@ -83,4 +83,24 @@ public class PComponentMap<K, V> extends ESimple<java.util.Map<K, V>> implements
         return o instanceof Path ? ((Path<?>) o).getMetadata().equals(metadata)
                 : false;
     }
+
+    @Override
+    public EBoolean containsKey(Expr<K> key) {
+        return Grammar.containsKey(this, key);
+    }
+
+    @Override
+    public EBoolean containsKey(K key) {
+        return Grammar.containsKey(this, key);
+    }
+
+    @Override
+    public EBoolean containsValue(Expr<V> value) {
+        return Grammar.containsValue(this, value);
+    }
+
+    @Override
+    public EBoolean containsValue(V value) {
+        return Grammar.containsValue(this, value);
+    }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/path/PEntityMap.java b/querydsl-core/src/main/java/com/mysema/query/types/path/PEntityMap.java
index 6d0b2c6f3..d0418733b 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/path/PEntityMap.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/path/PEntityMap.java
@@ -88,4 +88,24 @@ public class PEntityMap<K, V> extends Expr<Map<K, V>> implements PMap<K, V> {
         return o instanceof Path ? ((Path<?>) o).getMetadata().equals(metadata)
                 : false;
     }
+    
+    @Override
+    public EBoolean containsKey(Expr<K> key) {
+        return Grammar.containsKey(this, key);
+    }
+
+    @Override
+    public EBoolean containsKey(K key) {
+        return Grammar.containsKey(this, key);
+    }
+
+    @Override
+    public EBoolean containsValue(Expr<V> value) {
+        return Grammar.containsValue(this, value);
+    }
+
+    @Override
+    public EBoolean containsValue(V value) {
+        return Grammar.containsValue(this, value);
+    }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/path/PMap.java b/querydsl-core/src/main/java/com/mysema/query/types/path/PMap.java
index da2032c9b..f75589e9d 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/path/PMap.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/path/PMap.java
@@ -5,6 +5,7 @@
  */
 package com.mysema.query.types.path;
 
+import com.mysema.query.types.expr.EBoolean;
 import com.mysema.query.types.expr.Expr;
 
 /**
@@ -21,4 +22,12 @@ public interface PMap<K, V> extends Path<java.util.Map<K, V>> {
     Class<K> getKeyType();
 
     Class<V> getValueType();
+    
+    EBoolean containsKey(Expr<K> key);
+    
+    EBoolean containsKey(K key);
+    
+    EBoolean containsValue(Expr<V> value);
+    
+    EBoolean containsValue(V value);
 }
\ No newline at end of file