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2.2.1.2) Address Evaluation
Each part of an address is fully evaluated in turn. This means that a user
who selects the 'a' category in the next example ends up having 'hello world!'
being displayed in the top part of the browser:
a -> b/d
b -> c
c/d/ t: hello world!
When a user selects the 'a' category, the address 'b/d' is evaluated. First,
the 'b' part is evaluated. Because the 'b' category points to the 'c' category,
the 'c' category is entered. Next, the 'd' part is evaluated. Because there is
a 'd' subcategory of 'c,' this category is entered.
References can point to categories that in turn reference other categories
(circular references are intercepted by the browser):
category1 -> category2
category2 -> filename.dii
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