It checks to see if the dependent documents already exist in the Service Registry.
查看依赖文档是否已经存在于Service Registry中。
DocumentSelection is a class for the service used to represent a collection of documents.
DocumentSelection是面向此服务的类，该服务用来代表一个文档集。
Prepare documents for dispatch – enveloping service.
准备文件进行寄送-邮件装封服务。
Prepare documents for dispatch – enveloping service.
准备文件进行寄送-邮件装封服务。
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