Those suggestive lyrics, that boombastic Max Martin production, those coy-nymphet come-ons, those ellipses: No, it's not ''...Baby One More Time,'' but a single so close to Britney Spears' first hit that she could sue herself for plagiarism. As a statement of purpose, the single ''Oops!... I Did It Again'' on which Spears confesses ''I'm not that innocent'' after leading a boy on may be the supreme tart-pop anthem. But as music, it's just a faded Xerox.

