Some level of domain analysis must be done to determine the commonality that exists across the domain, and thus determine what types of services would have reuse value.
必须进行某种层次的域分析，以确定在整个域中存在的共性，从而确定哪种类型的服务具有重用价值。
However, for the expressions with the special value restrictions, it is difficult to calculate its domain by using static analysis.
但对某些有特殊取值限制要求的表达式，用静态分析方法，难以实现其输入变量的取值分析。
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