Mapfile Expression NULL value

[Emmanuel BELO]

Hi,

how do you handle NULL values from you database in your mapfile's 
expression?

Example (NULL value for some tx_femme):

  CLASS
     EXPRESSION (([tx_femme] > 8) AND ([tx_femme] <= 15))
     NAME "8 - 15"
     STYLE
       COLOR 255 217 0
     END
   END

I've tried:

EXPRESSION ('[tx_femme]' = 'NULL')

EXPRESSION /_always_false_/

Best regards,

Emmanuel BELO

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