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2.4.3)  Syntax Grammar

Finally, we give the grammar to which the expressions used in the reference types query and masking should adhere:
expr := expr ( "|" | "&" | "^" | "&&" | "||") clause | clause

clause := clause ( "=" | "<" | ">" | "!=" | "<=" | ">=" ) term | term

term := ["!"] "(" expr ")" | ["!"] identifier


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