现在少量修改可以由实现约束的外部决策逻辑完成，以便分别改变策略或修改规则。
Minor changes now can be done to external decision logic which implements the constraint, to alter policy or to change rule logic separately.
这包含通常的约束(举例来说，不知道什么能形成好的约束)，和缺乏了解如何在模型中实现约束。
This can include both constraints in general (for instance, not knowing what makes a good constraint), as well as a lack of knowledge regarding how to implement a constraint in a model.
除了用于基本的XSD模式验证以外，我们发现ISO Schematron对于实现约束和复杂的业务规则验证也非常有用。
We have found ISO Schematron useful in implementing constraints and complex business rules validations in addition to basic XSD schema validation.
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