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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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