a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.
When my digital secretary wants references to local yellow pages and weather forecast, the service discovery1 must be aware of my geospatial location. 当我的个人数字助理想参考本地黄页和天气预报，服务发现必须关心我的地理位置。
