Still odd.
The only use of word "formula" on the whole page is here:
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You will note that many of my examples don't include a lot of code. This is because many of the GOF-influenced patterns are mere "viewpoints" in the relational world, created by a trivial relational or Boolean formula, and not a physical code structure. This makes them easier and less intrusive to test and change. Thus, to us table fans, GOF-like patterns appear Neanderthalic. It is better abstraction to use formulas to represent repeating patterns than to physically repeat them. For one, the same items can more easily participate in multiple patterns. Think about it.
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No matter how much I thnk about it, I don't get it. Do you mean using "WHERE" clause of a SELECT (or may be a view) instead of a list or a table holding needed elements? Fine technique, when you can employ it. But not really new or deserving its own term. Or did you mean something deeper?