[Mapserver-users] Sharing mapfiles between apps and shapefiles between layers

[Michael Anderson]

Hello,

I am setting up three web sites that get most of their layers from one 
shapefile. To make it easier to maintain, I'd like to create one map file 
defining all the layers, and in it create approximately ten layers that all 
use the same shapefile. I would create the different layers from the 
shapefile using either a filter, or by using an expression in the classes I 
want to display for each layer. I'm wondering about any performance penalty 
I might encounter doing it this way. Would it be more efficient to create 
separate shapefiles for each layer? Does it matter if I use a filter on the 
layer or an expression in the classes? Thanks for any advice you can give 
me.

Mike

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