Xixiyang Industrial Co., Ltd. has signed a purchase and sale contract with Enterprise A. The contract stipulates that the company produces and installs two elevators for Enterprise A. The contract price is 6 million yuan. According to the contract, Enterprise A prepaid 30% of the price before delivering the goods. The rest of the price will be shipped to Enterprise A and installed by Xixiyang Company. Payment shall be made only after passing the inspection. Xixiyang Company shipped the completed elevators to Enterprise A on December 20, 2018. By December 31, 2018, it estimated that 50% of the elevator installation tasks had been completed. It is expected that all the elevators will be installed on January 31, 2019. Question: Should Xixiyang confirm its revenue in 2018 under the new revenue criteria? Should 2018 income be recognized under the current income criteria? Should revenue be recognized in 2018 under tax?