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diff --git a/Firebase/Database/Core/View/FCacheNode.h b/Firebase/Database/Core/View/FCacheNode.h
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+/*
+ * Copyright 2017 Google
+ *
+ * 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+@protocol FNode;
+@class FIndexedNode;
+@class FPath;
+
+/**
+* A cache node only stores complete children. Additionally it holds a flag whether the node can be considered fully
+* initialized in the sense that we know at one point in time, this represented a valid state of the world, e.g.
+* initialized with data from the server, or a complete overwrite by the client. It is not necessarily complete because
+* it may have been from a tagged query. The filtered flag also tracks whether a node potentially had children removed
+* due to a filter.
+*/
+@interface FCacheNode : NSObject
+
+- (id) initWithIndexedNode:(FIndexedNode *)indexedNode
+        isFullyInitialized:(BOOL)fullyInitialized
+                isFiltered:(BOOL)filtered;
+
+- (BOOL) isCompleteForPath:(FPath *)path;
+- (BOOL) isCompleteForChild:(NSString *)childKey;
+
+@property (nonatomic, readonly) BOOL isFullyInitialized;
+@property (nonatomic, readonly) BOOL isFiltered;
+@property (nonatomic, strong, readonly) FIndexedNode *indexedNode;
+@property (nonatomic, strong, readonly) id<FNode> node;
+
+@end