The ESB model promotes SOA-based integration with service contracts and metadata associated with the service contracts, such as Web Services Description Language (WSDL), schema, or policy.
ESB 模型促进了与服务契约和与服务契约相关联的元数据的基于 SOA 的集成，如 Web 服务描述语言（WSDL）、模式或策略。
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W3C Schema)来建模和验证其他XML数据。
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