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diff --git a/src/mongo/bson/bsontypes.h b/src/mongo/bson/bsontypes.h
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+++ b/src/mongo/bson/bsontypes.h
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+// bsontypes.h
+
+/*    Copyright 2009 10gen Inc.
+ *
+ *    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.
+ */
+
+#pragma once
+
+namespace bson { }
+
+namespace mongo {
+
+    class BSONArrayBuilder;
+    class BSONElement;
+    class BSONObj;
+    class BSONObjBuilder;
+    class BSONObjBuilderValueStream;
+    class BSONObjIterator;
+    class Ordering;
+    class Record;
+    struct BSONArray; // empty subclass of BSONObj useful for overloading
+    struct BSONElementCmpWithoutField;
+
+    extern BSONObj maxKey;
+    extern BSONObj minKey;
+
+    /**
+        the complete list of valid BSON types
+        see also bsonspec.org
+    */
+    enum BSONType {
+        /** smaller than all other types */
+        MinKey=-1,
+        /** end of object */
+        EOO=0,
+        /** double precision floating point value */
+        NumberDouble=1,
+        /** character string, stored in utf8 */
+        String=2,
+        /** an embedded object */
+        Object=3,
+        /** an embedded array */
+        Array=4,
+        /** binary data */
+        BinData=5,
+        /** Undefined type */
+        Undefined=6,
+        /** ObjectId */
+        jstOID=7,
+        /** boolean type */
+        Bool=8,
+        /** date type */
+        Date=9,
+        /** null type */
+        jstNULL=10,
+        /** regular expression, a pattern with options */
+        RegEx=11,
+        /** deprecated / will be redesigned */
+        DBRef=12,
+        /** deprecated / use CodeWScope */
+        Code=13,
+        /** a programming language (e.g., Python) symbol */
+        Symbol=14,
+        /** javascript code that can execute on the database server, with SavedContext */
+        CodeWScope=15,
+        /** 32 bit signed integer */
+        NumberInt = 16,
+        /** Updated to a Date with value next OpTime on insert */
+        Timestamp = 17,
+        /** 64 bit integer */
+        NumberLong = 18,
+        /** max type that is not MaxKey */
+        JSTypeMax=18,
+        /** larger than all other types */
+        MaxKey=127
+    };
+
+    /**
+     * returns the name of the argument's type
+     * defined in jsobj.cpp
+     */
+    const char* typeName (BSONType type);
+
+    /* subtypes of BinData.
+       bdtCustom and above are ones that the JS compiler understands, but are
+       opaque to the database.
+    */
+    enum BinDataType {
+        BinDataGeneral=0,
+        Function=1,
+        ByteArrayDeprecated=2, /* use BinGeneral instead */
+        bdtUUID = 3, /* deprecated */
+        newUUID=4, /* language-independent UUID format across all drivers */
+        MD5Type=5,
+        bdtCustom=128
+    };
+
+}