Who is listed under womens singles when year location is 1998 doha?
CREATE TABLE "table1_28138035_27" (
  "year_location" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text
);
SELECT "womens_singles" FROM "table1_28138035_27" WHERE "year_location"='1998 Doha';