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2.3.3)  Target has Real Subcategory

description: Used to make the address that the category points to be 'used' by references of the type query, selection and masking. These special reference types look for subcategories at any depth, yet in the same file flagged with '@' at the address that the category points to. When they encounter more '$'-flagged categories there, the target addresses of the corresponding categories are also evaluated, in a recursive fashion.

format:
$
example:
   ** sport.dii
   Sport
     /$Ball Sports -> ballsports.dii
     /$Motor Sports -> motorsports.dii
   Car Sports +> /Sport # wheels >= 4
   %

   ** motorsports.dii
   /@Formula 1
    p: wheels = 4
   /@Motor Racing
    p: wheels = 2
   /@Rally
    p: wheels = 4
   %

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