set point symbol size

[tom]

Dear All

I would like to know whether it is possible to set point symbol size dynamically. For example, I can create a size value as a parameter and pass to mapserv.exe. Since I am not using mapscript, so are there any simple way to do that?

I have tried the mapfile as follow, it is not work and parsing error is returned, unfortunately.

LAYER
  NAME TMP
  TYPE POINT
  STATUS DEFAULT
  CONNECTIONTYPE OGR
  CONNECTION "<OGRVRTDataSource><OGRVRTLayer name='TMP'>
<SrcDataSource>ODBC:POINT</SrcDataSource> 
  <SrcSQL>SELECT X,Y FROM TMP</SrcSQL>
<GeometryType>wkbPoint</GeometryType> 
        <LayerSRS></LayerSRS>
<GeometryField encoding='PointFromColumns' x='x' y='y'/> 
    </OGRVRTLayer></OGRVRTDataSource>"
  DATA "TMP"
  
  CLASS
    SYMBOL 'circle'
    size %SIZE%
    COLOR 0 0 255
    OUTLINECOLOR 128 128 128
  END
  
  END

Thanks for help.

Regards,
Tom
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