This paper presents an ecosystem for personal knowledge graphs (PKG), commonly defined as resources of structured information about entities related to an individual, their attributes, and the relations between them. PKGs are a key enabler of secure and sophisticated personal data management and personalized services. However, there are challenges that need to be addressed before PKGs can achieve widespread adoption. One of the fundamental challenges is the very definition of what constitutes a PKG, as there are multiple interpretations of the term. We propose our own definition of a PKG, emphasizing the aspects of (1) data ownership by a single individual and (2) the delivery of personalized services as the primary purpose. We further argue that a holistic view of PKGs is needed to unlock their full potential, and propose a unified framework for PKGs, where the PKG is a part of a larger ecosystem with clear interfaces towards data services and data sources. A comprehensive survey and synthesis of existing work is conducted, with a mapping of the surveyed work into the proposed unified ecosystem. Finally, we identify open challenges and research opportunities for the ecosystem as a whole, as well as for the specific aspects of PKGs, which include population, representation and management, and utilization.
翻译:本文提出了一个个人知识图(PKG)的生态系统,PKG通常被定义为与个人有关实体的结构化信息资源,它们的属性以及它们之间的关系。PKG是安全而复杂的个人数据管理和个性化服务的关键。但是,在PKG能够广泛应用之前,有一些需要解决的挑战。其中一个根本性挑战是什么构成PKG的定义,因为有多重解释。我们提出了自己的PKG定义,强调单个个人的数据所有权和提供个性化服务作为主要目的的方面。我们进一步认为,需要全面审视PKG以发挥他们的全部潜力,并提出了一个将PKG作为较大的生态系统的一部分并对数据服务和数据源具有清晰界面的统一框架。我们进行了现有工作的综合调查和综合,将调查的工作映射到提出的统一生态系统中。最后,我们确定了生态系统作为整体以及PKG特定方面(包括人口,表示和管理以及利用)的开放挑战和研究机会。