It also adds a fifth result-tree fragment type, but that rarely comes into play in simple extension functions.

它还添加了第五种类型——结果树片段，但在简单的扩展函数中很少用到。

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For each target, the tracing compound name or fragment the measurement should be traced to, and the data type that it should be traced as.

对于各目标，跟踪复合名称或者应该跟踪的度量片段，以及应该跟踪的数据类型。

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Listing 2 shows an XML fragment that describes a server type.

清单2给出一个描述服务器类型的xml片段。

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