EPEI: An RDF Retrieval System Based on Efficient Predicate-Entity Indexing

This paper proposes an RDF retrieval system that can swiftly establish indexes and maintains a relatively smaller index size with the following features: 1) using predicate-entity index structure to reduce disk space usage and construction time; 2) query enhancements based on worst-case optimal join; and 3) a user-friendly graphical interface. The experiment results demonstrate that our system uses less disk space, achieves more rapid index construction, and maintains competitive query performance compared to the latest RDF retrieval systems.