当某个试验再次注册时，应提交该试验所有已知的标识符，包括其他注册中心分配的试验注册编号。
When a trial is re-registered, all known identifiers for the trial should be submitted. These include trial registration Numbers allocated by other registries.
通过对信息进行加密，它可以确保该信息的机密性，包括标识和令牌的有效性。
By encrypting the information, it ensures the confidentiality of that information, for both the identity and the validity of the token.
Include元素给出了标识单独实体(在该XML文档之外)的URI，该实体是希望包括在XML文档中的实际数据。
The include element gives a URI that identifies a separate entity (outside the XML document) which is the actual data to be included in the XML document.
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