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?