主题表达式包含表达式类型、完全限定主题名称和前缀映射。
A topic expression is defined in terms of expression type, fully qualified topic name, and prefix mapping.
可以合理地假设，一个特定的规则可能在不同的地方以不同的格式表达，并且可以同时使用多个规则表达式类型。
It is reasonable to assume that a given rule may be expressed in multiple formats at different times, and that multiple rule expression types may be in use in parallel.
下面的代码示例阐释如何创建和使用一个简单的计算表达式类型，该计算表达式类型生成用于跟踪代码执行进度的某种控制台输出。
The following code example illustrates the creation and use of a simple computation expression type that generates some console output that tracks the progress of the execution of code.
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