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diff --git a/system/general/src/main/java/org/wamblee/system/core/CompositeInterfaceRestriction.java b/system/general/src/main/java/org/wamblee/system/core/CompositeInterfaceRestriction.java
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+++ b/system/general/src/main/java/org/wamblee/system/core/CompositeInterfaceRestriction.java
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+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ 
+package org.wamblee.system.core;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+
+/**
+ * Composite restriction that wraps a number of other restrictions. The restriction is 
+ * violated if one of the contained restrictions is violated. 
+ * 
+ * @author Erik Brakkee
+ *
+ */
+public class CompositeInterfaceRestriction implements InterfaceRestriction {
+    
+    private List<InterfaceRestriction> _restrictions; 
+    
+    /**
+     * Constructs the restriction. 
+     */
+    public CompositeInterfaceRestriction() { 
+        _restrictions = new ArrayList<InterfaceRestriction>();
+    }
+    
+    /**
+     * Constructs the restriction. 
+     * @param aRestrictions List of contained restrictions. 
+     */
+    public CompositeInterfaceRestriction(Collection<InterfaceRestriction> aRestrictions) { 
+        this(); 
+        _restrictions.addAll(aRestrictions);
+    }
+    
+    /**
+     * Adds a restriction. 
+     * @param aRestriction Restriction. 
+     * @return Reference to this composite restriction to allow call chaining. 
+     */
+    public CompositeInterfaceRestriction add(InterfaceRestriction aRestriction) { 
+        _restrictions.add(aRestriction);
+        return this; 
+    }
+
+    @Override
+    public boolean isViolated(Component aClient, RequiredInterface aRequired,
+            Component aServer, ProvidedInterface aProvided) {
+        for (InterfaceRestriction restriction: _restrictions) { 
+            if ( restriction.isViolated(aClient, aRequired, aServer, aProvided)) { 
+                return true; 
+            }
+        }
+        return false; 
+    }
+
+}

diff --git a/system/general/src/test/java/org/wamblee/system/core/CompositeInterfaceRestrictionTest.java b/system/general/src/test/java/org/wamblee/system/core/CompositeInterfaceRestrictionTest.java
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+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ 
+package org.wamblee.system.core;
+
+import java.util.Arrays;
+
+import org.easymock.classextension.EasyMock;
+import org.easymock.classextension.IMocksControl;
+import org.wamblee.test.EasyMockMatchers;
+import static org.easymock.classextension.EasyMock.*;
+
+import junit.framework.TestCase;
+
+public class CompositeInterfaceRestrictionTest extends TestCase {
+    
+    private Application _app = new Application(); 
+    private Environment _env = new Environment(); 
+
+    public void testEmpty() { 
+        InterfaceRestriction restriction = new CompositeInterfaceRestriction(); 
+        assertFalse(restriction.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+    }
+    
+    private void configureRestriction(InterfaceRestriction base, boolean aResult) {
+        base.isViolated(
+                (Component)anyObject(), 
+                (RequiredInterface)anyObject(), 
+                (Component)anyObject(), 
+                (ProvidedInterface)anyObject());
+        EasyMock.expectLastCall().andReturn(aResult);
+    }
+    
+    public void testOneRestriction() { 
+        IMocksControl control = EasyMock.createStrictControl();
+      
+        InterfaceRestriction base = control.createMock(InterfaceRestriction.class);
+        InterfaceRestriction composite = new CompositeInterfaceRestriction(
+                Arrays.asList(new InterfaceRestriction[] { base } ));
+        
+        // First let the base return false and verify the result. 
+        
+        configureRestriction(base, false);
+        
+        control.replay();
+        assertFalse(composite.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+        control.verify();
+        
+        // Second let the base return true and verify the result.
+        control.reset();
+        configureRestriction(base, true);
+        
+        control.replay();
+        assertTrue(composite.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+        control.verify();
+    }
+
+   
+    
+    public void testTwoRestrictions() { 
+        IMocksControl control = EasyMock.createStrictControl();
+        
+        InterfaceRestriction base1 = control.createMock(InterfaceRestriction.class);
+        CompositeInterfaceRestriction composite = new CompositeInterfaceRestriction(
+                Arrays.asList(new InterfaceRestriction[] { base1 } ));
+        InterfaceRestriction base2 = control.createMock(InterfaceRestriction.class);
+        composite.add(base2);
+        
+        // 1. base1 not violated and base 2 not violated -> not violated. 
+        
+        configureRestriction(base1, false);
+        configureRestriction(base2, false);
+        control.replay();
+        assertFalse(composite.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+        control.verify();
+        control.reset();
+        
+        // 2. base 1 not violated but base 2 violated -> violated
+        configureRestriction(base1, false);
+        configureRestriction(base2, true);
+        control.replay();
+        assertTrue(composite.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+        control.verify();
+        control.reset();
+        
+        // 3. base 1 violated -> violated and base 2 not called. 
+        configureRestriction(base1, true);
+        // base 2 should not be called.
+        control.replay();
+        assertTrue(composite.isViolated(_app, _app.getRequiredInterfaces()[0], 
+                _env, _env.getProvidedInterfaces()[0]));
+        control.verify();
+        control.reset();
+    }
+}