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2.3.2)  Real Subcategory

description: Used to make a category be 'used' by references of the type query, selection and masking. The property attributes of categories flagged with '@' are used to control the behaviour of these special reference types.

format:
@
example:
   Sport
     /Ball Sports
        /@Soccer
        /@Tennis
     /Motor Sports
        /@Formula 1
         p: wheels = 4
        /@Motor Racing
         p: wheels = 2
        /@Rally
         p: wheels = 4
   Car Sports +> /Sport # wheels >= 4
   %

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