How many womens singles entries are there when womens doubles is li xiaodan wen jia?
CREATE TABLE "table1_28138035_27" (
  "year_location" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text
);
SELECT COUNT("womens_singles") FROM "table1_28138035_27" WHERE "womens_doubles"='Li Xiaodan Wen Jia';