A validity class is based very closely on a corresponding DTD or XML Schema.
有效性类非常紧密地基于相应的DTD或XML Schema。
Will a particular XML document be validated against a given Schema or DTD?
会按照给定模式或DTD对某个特定XML文档进行验证吗？
Another difference observed is the flexibility in applying the constraints defined in XML Schema or Schematron.
观察到的另一个区别是在XML schema或schematron中定义的约束在应用方面的灵活性。
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