So they're stepping up pressure to ensure that doesn't happen. The mainland wants Chen to unequivocally accept that Taiwan is part of China. To Taiwan, agreeing to the principle would be tantamount to accepting that the island is part of the People's Republic of China. The signals from the mainland have been mixed. Yet mainland academic Yu Kelin, while visiting Taiwan recently, insisted that the term meant precisely that.
Different factions have different views in China.
Chen will also be pledging allegiance to the Constitution of the Republic of China. But Andrew Yang, a top Taiwan defense analyst on mainland affairs, is pessimistic. But Chen will not concede to 'one China' - not now, not ever. Which could ultimately mean war. Rumors have been rife that Beijing is already making war preparations along the southeastern coast.