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I have a set of PNG images I want to use as symbols in a point type layer in Mapserver. The file names come from the database in the DATA keyword, and if a file exists, it's all right. But if it does not exist, I'd like to use some default symbol. Something like this:

CLASS
    EXPRESSION ([symb_name] exists)
    STYLE
        SYMBOL [symb_name]
    END
END
CLASS
    STYLE
        SYMBOL 'default.png'
    END
END

Is there any way to accomplish this?

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    I fear that it is not supported. Consider making a feature request. As a workaround I would update the database and update the [symb_name] to really have 'default.png' as a default value. Alternatively, edit DATA to use CASE: IF symb_name is not null THEN use that, ELSE use symb_name='default.png'.
    – user30184
    May 1, 2016 at 21:31

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