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--- a/src/rcldb/rcldoc.h
+++ b/src/rcldb/rcldoc.h
@@ -157,6 +157,7 @@
     static const string keyau;  // author
     static const string keytt;  // title
     static const string keykw;  // keywords
+    static const string keymd5; // file md5 checksum
 };