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Create a derived layer

Question asked by babai on Oct 6, 2013
Latest reply on Oct 8, 2013 by babai

Hello All,

 

I'm new in calibre rule writing. I want to get a derived layer which consists of a numbers of layer.

 

like layer_final = (layer_1) + (layer_2) + (layer_3) + .......

Here I want, any of the input layer(layer_1, layer_2 etc) is missing then no derived layer should get created.

I think, normal OR operation is not capable of doing the same.

 

Please help!!!!!

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