When Mark O'meara was the senior player champion in a year greater than 1998, who was the tradition?
CREATE TABLE "senior_major_winners" (
  "year" real,
  "senior_pga_championship" text,
  "the_tradition" text,
  "senior_players_championship" text,
  "u_s_senior_open" text,
  "senior_british_open" text
);
SELECT "the_tradition" FROM "senior_major_winners" WHERE "year">1998 AND "senior_players_championship"='mark o''meara';