diff --git a/core/src/main/java/com/ibm/common/activitystreams/Collection.java b/core/src/main/java/com/ibm/common/activitystreams/Collection.java
index 8d48025..83abf21 100755
--- a/core/src/main/java/com/ibm/common/activitystreams/Collection.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/Collection.java
@@ -164,13 +164,28 @@ public class Collection
      **/
     protected abstract A create();
     
+    @Override
+    public B set(String key, Object value) {
+      if (key.equals("items")) {
+        if (value instanceof ArrayLinkValue) {
+          ArrayLinkValue alv = (ArrayLinkValue) value;
+          for (LinkValue lv : alv) {
+            list.add((ASObject)lv);
+          }
+        } else if (value instanceof ASObject)
+          list.add((ASObject) value);
+        return (B)this;
+      } else return super.set(key,value);
+    }
+
+
     /**
      * Method get.
      * @return A 
      * @see com.google.common.base.Supplier#get() 
      **/
     public A get() {
-      set("items", list.build());
+      super.set("items", list.build());
       return create();
     }
     
diff --git a/core/src/main/java/com/ibm/common/activitystreams/TypeValue.java b/core/src/main/java/com/ibm/common/activitystreams/TypeValue.java
index a02fd69..dffcfc6 100755
--- a/core/src/main/java/com/ibm/common/activitystreams/TypeValue.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/TypeValue.java
@@ -22,6 +22,8 @@
 package com.ibm.common.activitystreams;
 
 import java.io.Serializable;
+import java.util.Objects;
+
 import com.ibm.common.activitystreams.util.AbstractWritable;
 
 /**
@@ -122,7 +124,24 @@ public interface TypeValue
       super(builder);
       this.iri = builder.iri;
     }
-  
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(iri);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj)
+        return true;
+      if (obj == null)
+        return false;
+      if (getClass() != obj.getClass())
+        return false;
+      SimpleTypeValue other = (SimpleTypeValue) obj;
+      return Objects.equals(iri,other.iri);
+    }
+
     /**
      * Return the type value identifier
      * @return String 
diff --git a/core/src/main/java/com/ibm/common/activitystreams/internal/ASObjectAdapter.java b/core/src/main/java/com/ibm/common/activitystreams/internal/ASObjectAdapter.java
index 651eb64..348fe79 100755
--- a/core/src/main/java/com/ibm/common/activitystreams/internal/ASObjectAdapter.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/internal/ASObjectAdapter.java
@@ -223,7 +223,7 @@ public class ASObjectAdapter
           _class != null ?
             context.deserialize(val,_class) :
             primConverter.convert(val.getAsJsonPrimitive()));
-      else if (val.isJsonArray())        
+      else if (val.isJsonArray()) { 
         builder.set(
           name,
           LinkValue.class.isAssignableFrom(_class!=null?_class:Object.class) ?
@@ -233,7 +233,7 @@ public class ASObjectAdapter
               _class,
               context,
               builder()));
-      else if (val.isJsonObject())
+      } else if (val.isJsonObject())
         builder.set(
           name, 
           context.deserialize(
diff --git a/typext/pom.xml b/typext/pom.xml
index 80fdf66..9966778 100644
--- a/typext/pom.xml
+++ b/typext/pom.xml
@@ -149,5 +149,9 @@
       <version>4.3.3</version>
       <type>pom</type>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+    </dependency>
   </dependencies>
 </project>
\ No newline at end of file
diff --git a/typext/src/main/java/com/ibm/common/activitystreams/registry/CachingResolutionStrategy.java b/typext/src/main/java/com/ibm/common/activitystreams/registry/CachingResolutionStrategy.java
index be4d7bf..ff4455b 100644
--- a/typext/src/main/java/com/ibm/common/activitystreams/registry/CachingResolutionStrategy.java
+++ b/typext/src/main/java/com/ibm/common/activitystreams/registry/CachingResolutionStrategy.java
@@ -110,9 +110,18 @@ public abstract class CachingResolutionStrategy
       this.cache = cache;
     }
 
-    public void receive(TypeValue t) {
-      if (t.valueType() == ValueType.OBJECT && t.id() != null)
-        cache.put(Makers.type(t.id()),t);
+    public void receive(final TypeValue t) {
+      if (t.valueType() == ValueType.OBJECT && t.id() != null) {
+        final TypeValue tv = Makers.type(t.id());
+        cache.invalidate(tv);
+        try {
+          TypeValue tt = cache.get(tv, new Callable<TypeValue>() {
+            public TypeValue call() {
+              return t;
+            }
+          });
+        } catch (Throwable e) {}
+      }
     }
     
   }
diff --git a/typext/src/main/java/com/ibm/common/activitystreams/registry/TypeValueRegistry.java b/typext/src/main/java/com/ibm/common/activitystreams/registry/TypeValueRegistry.java
index c7daa80..e829e30 100644
--- a/typext/src/main/java/com/ibm/common/activitystreams/registry/TypeValueRegistry.java
+++ b/typext/src/main/java/com/ibm/common/activitystreams/registry/TypeValueRegistry.java
@@ -22,6 +22,7 @@ import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.ListeningExecutorService;
 import com.google.common.util.concurrent.Monitor;
 import com.ibm.common.activitystreams.IO;
+import com.ibm.common.activitystreams.Makers;
 import com.ibm.common.activitystreams.TypeValue;
 import com.ibm.common.activitystreams.ValueType;
 import com.ibm.common.activitystreams.ext.ExtModule;
@@ -165,11 +166,21 @@ public final class TypeValueRegistry
       future, 
       new FutureCallback<Object>() {
         public void onSuccess(Object result) {
-          readyStatus = Status.READY;
+          monitor.enter();
+          try {
+            readyStatus = Status.READY;
+          } finally {
+            monitor.leave();
+          }
         }
         public void onFailure(Throwable t) {
-          readyStatus = Status.ERROR;
-          loadError = t;
+          monitor.enter();
+          try {
+            readyStatus = Status.ERROR;
+            loadError = t;
+          } finally {
+            monitor.leave();
+          }
         }
       });
     return future;
@@ -205,6 +216,18 @@ public final class TypeValueRegistry
         (ThreadPoolExecutor)newFixedThreadPool(1)));
   }
   
+  public Future<TypeValue>resolveNoWait(String id) {
+    return resolveNoWait(Makers.type(id));
+  }
+  
+  public Future<TypeValue>resolve(String id) {
+    return resolve(Makers.type(id));
+  }
+  
+  public Future<TypeValue>resolve(String id, long duration, TimeUnit unit) {
+    return resolve(Makers.type(id),duration,unit);
+  }
+  
   public Future<TypeValue>resolveNoWait(TypeValue tv) {
     try {
       if (tv == null) return immediateCancelledFuture();
diff --git a/typext/src/test/java/com/ibm/common/activitystreams/ext/test/ExtTest.java b/typext/src/test/java/com/ibm/common/activitystreams/ext/test/ExtTest.java
new file mode 100644
index 0000000..1d80d54
--- /dev/null
+++ b/typext/src/test/java/com/ibm/common/activitystreams/ext/test/ExtTest.java
@@ -0,0 +1,35 @@
+package com.ibm.common.activitystreams.ext.test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.util.concurrent.Future;
+
+import org.junit.Test;
+
+import static com.ibm.common.activitystreams.Makers.type;
+
+import com.google.common.util.concurrent.Monitor;
+import com.ibm.common.activitystreams.Collection;
+import com.ibm.common.activitystreams.IO;
+import com.ibm.common.activitystreams.Makers;
+import com.ibm.common.activitystreams.TypeValue;
+import com.ibm.common.activitystreams.ext.ExtModule;
+import com.ibm.common.activitystreams.registry.TypeValueRegistry;
+
+public class ExtTest {
+
+  private static final IO io = IO.makeDefault(ExtModule.instance);
+  
+  @Test
+  public void extTest() throws Exception {
+    
+    TypeValueRegistry tvr = 
+      TypeValueRegistry
+        .makeDefaultSilent(io);
+    
+    Future<TypeValue> object = tvr.resolve("urn:example:verbs:foo");
+    
+    System.out.println(object.get().valueType());
+  }
+  
+}
diff --git a/typext/src/test/resources/typeValues.json b/typext/src/test/resources/typeValues.json
new file mode 100644
index 0000000..c00d402
--- /dev/null
+++ b/typext/src/test/resources/typeValues.json
@@ -0,0 +1,15 @@
+{
+  "objectType": "collection",
+  "items": [
+    {
+      "objectType": "verb",
+      "id": "urn:example:verbs:foo",
+      "displayName": "Foo"
+    },
+    {
+      "objectType": "objectType",
+      "id": "urn:example:types:bar",
+      "displayName": "Bar"
+    }
+  ]
+}
\ No newline at end of file