to restrict the item-type to restaurants use: bq=[item type:restaurants] but the item-type data submitted by users would probably need to be defined-by and enforced by google -- or some collective adherence to a set or rules -- for such queries to behave.
since neither is true and there seems to be only 53 total results for that item-type the results will be rather sparse. the results are at the mercy of the lack of data. i believe the example was rather abstract and academic; maybe at one point in time the item-type had more data -- or, is this item-type data you're submitting.
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