首先开发了一个简单的日历xml规范，然后逐步地添加附加的聚合XML规范层。
Initially a simple calendar XML specification was developed, then layers of additional aggregate XML specifications were added over time.
请期待第 2 部分，我们将开发一个支持语音的日历。
Stay tuned for Part 2, which will look at developing a voice-enabled calendar.
图 1 显示了 Chandler，一个在开放源码应用程序基础上开发的日历和电子邮件管理程序。
Figure 1 shows Chandler, a calendar and e-mail management program in development at the Open Source Application Foundation.
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