在处理电子邮件和附件时，您可能已经遇到过MIME类型，但MIME规范描述了识别数据格式的更通用的机制。
You may have run across MIME types when working with E-mail and attachments, but the MIME specification describes a more general-purpose mechanism for identifying data forms.
WSDL描述了输入输出变量的数据类型、每一个服务的操作集的名称、客户调用服务必须遵守的格式等等。
WSDL describes the data types of the input-output variables, the name of the set of operations in each service, the format that the client must follow to invoke a service, and so on.
签名格式扩展了字段和方法描述符的概念，将泛型类型信息包含于其中。
The signature format extends the idea of field and method descriptors to include generic type information.
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