因为用户界面是程序最初的入口，所以它必须能够用于多种目的。
Because it is the initial gateway to a program, the user interface must be able to serve multiple purposes.
如果将一种文档类型用于多种目的，那么应该为每种目的提供一个样例。
If you use a document type for multiple purposes, you should provide a sample for each purpose.
出于多种目的，包括用于投递类型，Sametime使用整型常量作为标识符。
Sametime USES integer constants as identifiers for various purposes, including post types.
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