I would like to load RDF HDT (Header, Dictionary, Triples) files in a Rust application but haven't found any library that supports this. Before doing it myself or asking others to add it to their RDF libraries, I wanted to ask if there have been any existing efforts to load HDT with Rust.

Where I have unsuccessfully searched:


  • github.com/timplication/hdt-rs has been removed
    – andrefs
    Apr 24 at 21:31
  • 1
    @andrefs: Thanks for the notice! The author of hdt-rs and I ended up cooperating on a new version, the original prototype is not available anymore, I added an answer and a notice in the question, I hope this way makes the most sense for future HDT users. Apr 25 at 10:23

1 Answer 1


The hdt crate is a Rust library that allows loading existing HDT files in default format and querying using triple patterns. It has an adapter for the Sophia Rust RDF library, so that existing Sophia-based applications can load HDT files as well.

Explanation: The owner of https://github.com/timplication/hdt-rs (not available anymore) allowed me to build upon his now discontinued prototype. We currently have a paper about it on review in the Journal of Open Source Software (JOSS), read the current draft here.

API documentation is published at https://docs.rs/hdt/latest/hdt/.

Example usage from the docs:

use hdt::Hdt;
// Load an hdt file
let file = std::fs::File::open("example.hdt").expect("error opening file");
let hdt = Hdt::new(std::io::BufReader::new(file)).expect("error loading HDT");
// query
let majors = hdt.triples_with_pattern(Some("http://dbpedia.org/resource/Leipzig"), Some("http://dbpedia.org/ontology/major"),None);
println!("{:?}", majors.collect::<Vec<_>>());

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