规划：详细的系统要求、产品支持生命周期、迁移规划。
Plan: Detailed system requirements, product support lifecycle, migration planning.
清单7告诉您怎样扩展您的服务实现类来支持生命周期管理以及怎样使用服务上下文。
Listing 7 shows you how to extend your service implementation class to support life cycle management and how to use the service context.
PDE 还支持完整的生命周期开发，包括分发和维护。
The PDE also supports full life cycle development, including distribution and maintenance.
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