BEIJING (AP) — Foreigners who want to buy Alibaba Group shares in the Chinese e-commerce giant's U.S. public offering will need to get comfortable with an unusual business structure. Alibaba's online and mobile commerce businesses will be controlled by a "variable interest entity," an arrangement meant to allow investors to buy into Internet and other businesses in which Beijing bans or limits foreign ownership. Foreign shareholders get a stake in that offshore vehicle and profits but no ownership of the Chinese company. In a filing with U.S.