Resource Description Framework (RDF) triplestores and Property Graph (PG) database systems are two approaches for data management that are based on modeling, storing and querying graph-like data. Given the heterogeneity between these systems, it becomes necessary to develop methods to allow interoperability among them. While there exist some approaches to exchange data and schema between RDF and PG databases, they lack compatibility and even a solid formal foundation. In this paper, we study the semantic interoperability between RDF and PG databases. Specifically, we present two direct mappings (schema-dependent and schema-independent) for transforming an RDF database into a PG database. We show that the proposed mappings possess the fundamental properties of semantics preservation and information preservation. The existence of both mappings allows us to conclude that the PG data model subsumes the expressiveness or information capacity of the RDF data model.
翻译:资源描述框架(RDF)三层楼和财产图数据库系统(PG)是数据管理的两个方法,其基础是建模、储存和查询图形类数据。鉴于这些系统之间的差异性,有必要制定方法,使这些系统能够互操作性。虽然在RDF数据库和PG数据库之间有一些交换数据和模型的方法,但它们缺乏兼容性,甚至缺乏坚实的正式基础。在本文件中,我们研究了RDF数据库和PG数据库之间的语义互操作性。具体地说,我们提出了两种直接绘图(依赖Schema和Schema独立),将RDF数据库转换成PG数据库。我们表明,拟议的绘图具有语义保护和信息保存的基本特性。这两种绘图的存在使我们可以得出结论,PG数据模型将RDF数据模型的表达性或信息能力归为子。