locationdataservice类是从数据库中检索位置相关数据的数据提供者。
The LocationDataService class is a data provider to retrieve location-related data from the database.
LocationFormDataProvider 类提供了位置相关数据来获得特定的邮政编码值。
The LocationFormDataProvider class provides the location-related data for the specified zip code value.
如果所缓存的数据是位置相关数据，那么，随着客户端位置的改变，所缓存的数据值可能变得无效了，因此，对所缓存数据值进行有效与否的判别至关重要。
If the cached data are location-dependent data, then with the client changing its location, the cached data value may become invalid, so deciding the validation of the cached data is very important.
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