Hong Kong stocks edge up at open

The Hang Seng Index rose 0.22 percent, or 62.90 points, to 28,856.78.

But the benchmark Shanghai Composite Index edged down 0.07 percent, or 2.41 points, to 3,278.40 and the Shenzhen Composite Index, which tracks stocks on China's second exchange, eased 0.16 percent, or 3.00 points, to 1,898.09.