No base class to extend, no abstract methods to implement, no controller to coordinate with. Just an object with the right shape.
投资 50 亿元，刘强东宣布造游艇
，详情可参考safew官方版本下载
FT Edit: Access on iOS and web
For additional guidance:
"In hindsight, we should have provided more detail about our intentions and how the process works."