ETSI TR 119 400为信托服务提供商提供了选择标准和选项的指导 ETSI TR 119 000[i.2]中确定的支持数字签名和相关服务（区域4）。 本文件描述了与该领域相关的业务范围参数（见第5条）以及 考虑到业务范围参数，可以确定该领域的相关标准和选项（见第6条）。本文件的目标受众包括:可能需要数字签名支持的业务经理，尤其是提供 在他们的业务中，相关的支持信托服务将在这里找到关于数字签名的解释 标准可以用来满足他们的业务需求。应用程序架构师将在这里找到指导他们设计应用程序的整个过程的材料 完全且适当地满足所有特定于数字产品的业务和法律/监管要求的系统 签名，尤其是提供相关的支持性信托服务。他们将获得更好的回报 了解如何选择要实施和/或使用的适当标准。系统开发人员将在本文件中了解以下主要原因: 引导系统按原样设计，并正确了解系统中存在的标准 他们需要详细了解，以便进行适当的开发。

ETSI TR 119 400 provides guidance on the selection of standards and options for the trust service provider supporting digital signatures and related services (area 4) as identified in ETSI TR 119 000 [i.2]. The present document describes the business scoping parameters relevant to this area (see clause 5) and how the relevant standards and options for this area can be identified given the business scoping parameters (see clause 6).The target audience of the present document includes:Business managers who potentially require support from digital signatures and in particular the provision of related supporting trust services in their business will find here an explanation of how digital signatures standards can be used to meet their business needs.Application architects who will find here material that will guide them throughout the process of designing a system that fully and properly satisfies all the business and legal/regulatory requirements specific to digital signatures and in particular the provision of related supporting trust services. They will gain a better understanding on how to select the appropriate standards to be implemented and/or used.Developers of the systems who will find in the present document an understanding of the main reasons that lead the systems to be designed as they were, as well as a proper knowledge of the standards that exist in the field and that they need to know in detail for a proper development.