AsyncOperation(
            ReachSerializerContext context
            )
        {
            switch (context.Action)
            {
            case SerializerAction.endPersistObjectData:
            {
                EndPersistObjectData();
                break;
            }

            case SerializerAction.serializeNextDocumentReference:
            {
                DocumentReferenceCollectionSerializerContext thisContext =
                    context as DocumentReferenceCollectionSerializerContext;

                if (thisContext != null)
                {
                    SerializeNextDocumentReference(thisContext.Enumerator,
                                                   thisContext.ObjectContext);
                }

                break;
            }

            default:
            {
                base.AsyncOperation(context);
                break;
            }
            }
        }
        SerializeDocumentReferences(
            SerializableObjectContext serializableObjectContext
            )
        {
            IEnumerator enumerator =
                ((System.Collections.Generic.IEnumerable <DocumentReference>)serializableObjectContext.TargetObject).
                GetEnumerator();

            enumerator.Reset();

            DocumentReferenceCollectionSerializerContext
                context = new DocumentReferenceCollectionSerializerContext(this,
                                                                           serializableObjectContext,
                                                                           enumerator,
                                                                           SerializerAction.serializeNextDocumentReference);

            ((IXpsSerializationManagerAsync)SerializationManager).OperationStack.Push(context);
        }
        SerializeNextDocumentReference(
            IEnumerator enumerator,
            SerializableObjectContext serializableObjectContext
            )
        {
            if (enumerator.MoveNext())
            {
                DocumentReferenceCollectionSerializerContext
                    context = new DocumentReferenceCollectionSerializerContext(this,
                                                                               serializableObjectContext,
                                                                               enumerator,
                                                                               SerializerAction.serializeNextDocumentReference);


                ((IXpsSerializationManagerAsync)SerializationManager).OperationStack.Push(context);

                object documentReference = enumerator.Current;

                SerializeDocumentReference(documentReference);
            }
        }