校验——根据预先定义的规则对订单进行校验。
环境监测让应用用预先定义的规则观察他们的周围。
An environment monitoring allows applications to observe its surroundings using rules that have been defined apriori.
这些验证规则可以是预先进行定义的(JSF中提供的)，也可以由开发者进行定义。
The validation rules can be pre-defined (shipped with JSF) or defined by the developer.
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