+use constant NONE => 0;
+use constant INFO => 1;
+use constant DEBUG1 => 2;
+use constant DEBUG2 => 4;
+use constant QUERY => 8;
+use constant TRACE => 16;
+use constant BACKTRACE_ON_ERROR => 32;
+use constant ALL => 63;
+
+use constant FILE_TARGET => 0;
+use constant STDERR_TARGET => 1;