Sisifo: uma abordagem semântica para construção de Enterprise Knowledge Graphs

Abstract

As a technology to support knowledge management, Knowledge Graphs (KGs) can be used as a way to express knowledge using especially the meaning of the data and formally representing the relationships between the concepts of independently. The application of a data model using a semantic layer on the data integrated in a KG in the corporate scope produces a Enterprise Knowledge Graph (EKG). In a EKG, knowledge is organized into a network of nodes and links, containing business objects and topics closely linked, classified, semantically enriched and connected to existing data and documents. However, building and maintaining EKGs that use semantics as a way of enriching data processing becomes a complex task, largely due to the need for knowledge and effort invested in the activities and handling of tools used in the process of semantic integration. This work proposes a semantic approach for building, maintaining and reusing EKG in a semi-automatic way. For this, the main contributions of this work are: i) A Semantic Approach for building EKGs; ii) Organize and structure the knowledge involved in the Construction of an EKG through the steps of: competence issues, modeling of the domain ontology, specification (modeling of each exported ontology, mapping and metadata definitions), publication of EKG views and validation ; iii) Support, by means of appropriate tools and guidelines, the whole process of semantic construction of EKGs in order to provide the possibility of extending and reusing knowledge; iv) An Ontological Representation to specify and describe EKGs (EKG-Ontology). As validation, experiments were used through case studies with an emphasis on the construction of EKG s using the steps of the proposed approach guided by an operational version of EKG-Ontology for instantiation and semantic representation of EKG in the tax tax domain (organizations, partners and taxpayers). After carrying out the experiments, SISIFO presented good results in terms of validation through case studies. Thus, SISIFO demonstrated to provide a way to build, formally specify and manage EKGs through the vocabulary described in EKG-Ontology, allowing its use to be extended to demonstrate other applications and studies.