ITR: Grammar-based graph compression supporting fast triple queries

Neighborhood queries are the most common queries on graphs; thus, it is desirable to answer them efficiently on compressed data structures. We present a compression scheme called Incidence-Type-RePair (ITR) for graphs with labeled nodes and labeled edges based on RePair and apply the scheme to network, version, and RDF graphs. We show that ITR performs neighborhood queries and triple queries in only a few milliseconds and thereby outperforms existing solutions while providing a compression size comparable to existing graph compressors.