Support for HDT's with graph names

[mightymax]

It is possible to create HDT's from quads with a named graph. The Node HDT library does not seem to support his. Would it be possible to add this feature?

Given this RDF (n-quads format) saved as test.nq:

<S> <P> <O> <G> .

I have created a HDT with the hdt-java tool:

rdf2hdt.sh -index  -rdftype nquad ./test.nq ./test.hdt

If I now open this HDT with the Node library:

const hdt = require('hdt');
hdt.fromFile('./test.hdt').then(function(hdtDocument) {
  return hdtDocument.close();
});

The script fails with the following error:

node:internal/process/promises:394
    triggerUncaughtException(err, true /* fromPromise */);
    ^

[Error: Dictionary Implementation not available]

Node.js v22.14.0

The issue is probably caused by the HDT C++ implementation which also does not seem to support HDT's with quads (same error ERROR: Dictionary Implementation not available):

hdtSearch test.hdt

See this issue.

The HDT Java tools can work with Quads/Named Graphs.

[rubensworks]

This project makes use of the HDT C++ version.
If that library is updated to include quad support, then we can definitely include it here as well! :-)

[mightymax]

I have commented on an existing issue in the HDT C++ repo, hopefully it will be picked up. The project does not have a lot of activity...