DTD validators provide basic structural validation.
DTD验证器提供基本的结构化验证。
However, such industry specific schemas are loosely bound with minimal validations and can be used for only structural validation of the incoming XML.
但这些行业规范模式是由最小验证松散结合的，仅能用于传入XML的结构验证。
Validation is a process of checking whether the instance document satisfies structural, data type, and content constraints specified in the XML schema.
验证就是检查实例文档是否满足在XML模式中指定的结构、数据类型和内容限制的过程。
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