Header Dictionary Triples (HDT) for SWI-Prolog

This repository is work in progress to provide access to HDT files from SWI-Prolog based on the C++ library for these files.

HDT files form a natural addition to SWI-Prolog's memory based RDF store to access large amounts of static background knowledge without enlarging the memory footprint.

This repository is organised as a SWI-Prolog pack. To install it, perform the steps below. Installation and usage is tested on Ubuntu and Fedora. This should work on most Unix-like machines. Installation on Windows requires more creativity though.

Installation

1. Install a recent version of Serd. One way of doing this on Ubuntu is: sudo apt install libserd-0-0 serdi

The currently installed version can be found by the command serdi -v. The minimum version of Serd is 0.28.0 (see hdt-cpp/README.md or the before_install rule in hdt-cpp/.travis.yml).

If that isn't available, it can be installed and built by:

curl -s http://download.drobilla.net/serd-0.30.0.tar.bz2 | tar -xj && \
  cd serd-0.30.0 && \
  python2 ./waf configure && \
  python2 ./waf && \
  sudo ./waf install;

You may wish to specify --prefix=/usr/local or --prefix=$HOME/.local to waf configure.

You can uninstall by python2 ./waf uninstall

2. Install Raptor2.

   On Fedora: sudo dnf install raptor2-devel

   On Ubuntu: sudo apt-get install libraptor2-dev

3. After the prerequisites are installed, the HDT library can be installed from within Prolog using the following command:

?- pack_install(hdt).

Usage

If the installation went well, you can load the HDT library with the following command:

?- [library(hdt)].

Status

Usable, but still experimental.