TripAdvisor, the travel community owned by Bellevue-based Expedia, said Friday that it has signed a transaction to acquire Kuxun.cn, which it says is the second largest online travel web site in China. Financial terms of the acquisition were not disclosed. Kuxun provides flight, hotel, and train booking services for the Chinese market. TripAdvisor said Kuxun.cn will continue to operate out of Beijing, led by its current management team.