它是使用XML模式定义语言编写的，描述了XML文档的内容结构和约束。
It is written in the XML Schema definition language to describe the structure and constrain the content of XML documents.
传统模式语言如文档类型定义（DTD）、W3C Schemas和RELAX NG 的严格性带来了脆弱性。
The rigidity of traditional schema languages like Document Type Definitions (DTDs), W3C Schemas, and RELAX NG causes fragility.
模式是一个格式良好的XML文档，它使用强大的XML模式定义语言(XSDL，有时也叫做W3CSchema)来建模和验证其他XML数据。
A schema is a well-formed XML document that USES the powerful XML schema Definition Language (XSD, also sometimes called W3C schema) to model and validate other XML data.
模式是一个格式良好的XML文档，它使用强大的XML模式定义语言(XSDL，有时也叫做W3CSchema)来建模和验证其他XML数据。
A schema is a well-formed XML document that USES the powerful XML schema Definition Language (XSD, also sometimes called W3C schema) to model and validate other XML data.
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