SOAP规范使某些东西可选—比如，SOAP规范使您能够选择为已编码的参数传送类型信息。
The SOAP specification makes certain things optional — for instance, the SOAP specification makes it optional to send type information for encoded parameters.
不过，您不能使用该参数传送动态页面实例的ID，因为在启动页面之前您不知道它的ID。
However, you could not transmit the ID of the dynamic page instance using that argument because you do not know the ID before the page has been launched.
接口名称变成了类型，可以当作参数传送。
Interface names become types and can be passed as parameters.
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