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.