When President Trump travels to Beijing next week (May 14–15) to meet with Xi Jinping, one major outcome could be a new way to manage the two nations’ often fractious trade ties, sources close to the talks say.  The “Board of Trade,” as the U.S. side terms it, would have a limited goal — figuring out which products the two nations would be willing to trade even when relations are strained, while clearly delineating which products, such as the U.S.’s most advanced chips, would