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--- a/src/rcldb/rcldoc.h
+++ b/src/rcldb/rcldoc.h
@@ -163,6 +163,7 @@
     static const string keybcknd; // backend type for data not from the filesys
     // udi back from index. Only set by Rcl::Query::getdoc().
     static const string keyudi;
+    static const string keyapptg; // apptag. Set from localfields (fsindexer)
 };