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In this paper we focus on the following constrained reachability problem overedge-labeled graphs like RDF -- "given source node x, destination node y, and asequence of edge labels (a, b, c, d), is there a path between the two nodessuch that the edge labels on the path satisfy a regular expression"*a.*b.*c.*d.*". A "*" before "a" allows any other edge label to appear on thepath before edge "a". "a.*" forces at least one edge with label "a". ".*" after"a" allows zero or more edge labels after "a" and before "b". Our queryprocessing algorithm uses simple divide-and-conquer and greedy pruningprocedures to limit the search space. However, our graph indexing technique --based on "compressed bit-vectors" -- allows indexing large graphs whichotherwise would have been infeasible. We have evaluated our approach on graphswith more than 22 million edges and 6 million nodes -- much larger compared tothe datasets used in the contemporary work on path queries.

BitPath -- Label Order Constrained Reachability Queries over Large Graphs