[postgis] How to use EXPRESSION string?

[s8854617]

Dear Sir:
  When I try to use mapserver+postgis, there is a problem that
I can't resolve. my table is following:
        post_map
        aa48 char(4)
        aa49 char(4)
        shape geometry
        aa08 char(1)
I want to draw my map like following:

 (my map file)
..  
  DATA "shape from post_map"
  STATUS DEFAULT
  TYPE POLYGON
  CLASS
    EXPRESSION ([aa08] = 'F')
    COLOR 0 255 255
    OUTLINECOLOR 0 255 255
  END      
....
Is the "EXPRESSION ([aa08] = 'F') correct?
My mapserver can't handle this judgement, could anybody tell
me how to use EXPRESSION with string comparision?


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