[Developers] Category list

[Zodiac Seven]

I'm writing a small app on FreeBase.
I'm trying to build a category tree which shows the main categories (sports,
arts & crafts, etc.) and lets the user drill down to additional sub
categories.
Is there something like this already built which I can use?

I notice that I can get a list of the categories for "Sports" like this:

{ "query" : [ { "domains" : [ { "id" : null, "name" : null, "type" :
"/type/domain" } ], "name" : "Sports", "type" : "/freebase/domain_category"
} ]}

but I can't figure out how to get a list of categories under
"Sports/Basketball"

Regards,

Deepak.
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