We'll need some error messages of course, a set for each validated property, one message per validation rule.
很显然，我们需要一些错误消息，每个验证的属性都需要一套，每个验证规则需要一条消息。
Many business-line applications have requirements to validate form fields based on business rules. Each business rule is unique, but the following are a few examples of business validation rules.
很多业务应用程序都有基于业务规则验证表单字段的要求。
The cleaning operation of data and utilize rule to do validation on cleaned data all belongs to logic.
对数据的清洗操作，利用规则对清洗后的数据进行的验证等等都属于逻辑。
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