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diff --git a/infra/data-api/src/main/java/io/fd/honeycomb/v3po/data/ModifiableDataManager.java b/infra/data-api/src/main/java/io/fd/honeycomb/v3po/data/ModifiableDataManager.java
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+++ b/infra/data-api/src/main/java/io/fd/honeycomb/v3po/data/ModifiableDataManager.java
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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.v3po.data;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * Facade over data tree that allows tree modification.
+ */
+@Beta
+public interface ModifiableDataManager extends ReadableDataManager {
+
+ /**
+ * Creates read-only snapshot of a ModifiableDataTree.
+ *
+ * @return modification
+ */
+ DataModification newModification();
+}