OntLMS: An Ontology-Based Lifelog Management System

In this paper, we propose an ontology-based lifelog management system, called OntLMS, which is built by utilizing the existing lifelog management system based on the relational data model. We design ontology for modelling lifelog data and provide both one-time and incremental conversion methods that transform lifelog data in the relational database into ontology. Our system supports expressive, user-centric queries such as a structured query and a keyword query, as well as a visual query. This paper shares the lessons learned from our experience on lifelog management, data migration over different data models, and ontology design.