CPF实体很复杂。例如，一个CPF实体可以表示多个身份，或者一个身份可以与多个不同的CPF实体相关联。这需要一个标准的揭示方案来实现CPF实体可以采用的各种揭示方式。为了适应CPF实体的多样性，EAC-CPF定义了以下概念：
- 单一身份
- 在一个EAC-CPF条目中代表具有单一身份的一个人（或组织或家庭）。这是最常见的身份类型。
- 多重身份-一对多
两个或多个身份（包括官方身份），全部都在一个EAC-CPF条目中的描述表示之后可以以编程方式转换为多重身份-一对多。
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- 多重身份-多对一
- 两个或多个身份（包括官方身份），每个身份在两个或多个相互关联的EAC-CPF条目中的描述表示之后可以以编程方式转换为多重身份-多对一。
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- 协作身份
- 由两个或更多人共享的单一身份（例如，在创作共同作品时共享笔名的多个作者）。使用多重身份-一对多模式描述。
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- 替代规范控制档
- 派生的EAC-CPF实例，它基于并包含同一实体的两个或多个替代EAC-CPF实例。 由联盟或其他联合编目组织使用，提供联合访问权限，以访问由两个或多个机构在两个或多个系统中维护的规范记录。 替代的EAC-CPF实例可以使用不同的语言或相同的语言。
EAC-CPF的创立是为了适应这些身份的复杂性，提供多种基于单个数据库或内容聚合器首选项的方式来表达这种复杂性。这些选项反映了一个设计原则，该原则强调了数据库或内容聚合器为特定需求定制标准以确保未来的聚合。 这些灵活性也反映了国际社会在处理与同一CPF实体的不同身份相关的信息方面存在一些根本的思维差异。EAC-CPF对这些思维差异保持中立立场，而是在不排除未来聚合的情况下给出了适应他们的选项。
出于此元素字典的目的，记录维护者(agents)指的是创建或维护EAC-CPF条目的机构或服务方，而实体（entities）指的是记录所涉及的客观存在。
- ------------------原文--------------------
CPF Entities are complex. For example, one CPF entity can represent multiple identities, or a single identity can be associated with several different CPF entities. This fact necessitates the structure of a standard to account for the various ways in which CPF entities can be expressed. In order to accommodate the variety of CPF entities, EAC-CPF has adopted the following definitions:
SINGLE IDENTITY: one person (or corporate body or family) with a single identity represented in one EAC-CPF instance. This is the most common identity type.
MULTIPLE IDENTITY-MANY IN ONE: two or more identities (including official identities) with each represented by distinct descriptions within one EAC-CPF instance. Can be programmatically converted into Multiple Identity-One in Many.
MULTIPLE IDENTITY-ONE IN MANY: two or more identities (including official identities) each represented in two or more interrelated EAC-CPF instances. Can be programmatically converted into Multiple Identity-Many in One.
COLLABORATIVE IDENTITY: a single identity shared by two or more persons (e.g. a shared pseudonym used in creation of a collaborative work). Use Multiple Identity-One in Many.
ALTERNATIVE SET: derived EAC-CPF instance that is based on and incorporates two or more alternative EAC-CPF instances for the same entity. To be used by a consortia or a utility providing union access to authority records maintained in two or more systems by two or more agencies. Alternative EAC-CPF instances may be in different languages or in the same language.
EAC-CPF has been created to accommodate this variety of identities, and includes a number of ways to express complexities based on individual repository or aggregator preferences. These options reflect a design principle that underscores increased opportunity for repositories or aggregators to customize the standard for specific needs while at the same time ensuring future aggregation. These flexibilities also reflect an acknowledgement that some fundamental philosophical differences with regard to the processing of information related to separate identities of the same CPF entity exist in the international community. EAC-CPF maintains a neutral stance on those philosophical differences and instead has accommodated the various options without precluding aggregation in the future.
For purposes of this tag library, agents refer to repositories or services creating or maintaining EAC-CPF records, while entities refer to those for which the records are about.
您正在阅读的中文版元素字典由复旦大学图书馆知识组织工作组制作（李彦霖、侯鑫鑫、苗青、薛玮），如果您对我们的翻译有任何疑问、评论和建议，请联系课题组负责人李彦霖（[li_yanlin@fudan.edu.cn](mailto:li_yanlin@fudan.edu.cn)）。课题组将跟进翻译下一版本的元素字典，您的宝贵意见有助于后续翻译工作顺利推进。
