Package "hdt"

Title:	Access RDF HDT files
Rating:	Not rated. Create the first rating!
Latest version:	0.5.4
SHA1 sum:	6ec58e4142562bfd4f3aebe9969299bc7740fb7b
Author:	Jan Wielemaker <J.Wielemaker@vu.nl>
Maintainer:	Jan Wielemaker <J.Wielemaker@vu.nl>
Packager:	Jan Wielemaker <J.Wielemaker@vu.nl>
Home page:	https://github.com/JanWielemaker/hdt
Download URL:	https://github.com/JanWielemaker/hdt.git
Requires:	prolog:c_cxx(_42488)

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Details by download location

Version	SHA1	#Downloads	URL
0.1	fabaf449337b875be05ccbf82cb84bdd0b25be6d	1	https://github.com/JanWielemaker/hdt.git
0.5	2e8c53ea2ae4961eeb33135d1d770d88064e7787	1	https://github.com/JanWielemaker/hdt.git
	3c8100b020fa505825f96cd27f6456a873aa6d64	2	https://github.com/JanWielemaker/hdt.git
	4d3be6578ad7fa088577143027bc60cca1a545eb	1	https://github.com/JanWielemaker/hdt.git
	69d13bfd2247aba9765b36b82de1731bf9324513	37	https://github.com/JanWielemaker/hdt.git
	9f0dfceb1cdc4e4c44345574447cb87f37855af4	2	https://github.com/JanWielemaker/hdt.git
	e0a0eff87fc3318434cb493690c570e1255ed30e	25	https://github.com/JanWielemaker/hdt.git
0.5.1	54aa746b75d04640758c7e62472e6b335a4a8926	1	https://github.com/JanWielemaker/hdt.git
0.5.3	056c1214412047c105cb0b060f21821bad9f3bfb	3	https://github.com/JanWielemaker/hdt.git
0.5.4	6ec58e4142562bfd4f3aebe9969299bc7740fb7b	4	https://github.com/JanWielemaker/hdt.git

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

Installing dependencies

In addition to the usual development tools such as make and a C compiler, we need GNU automake and related tools and the RDF base libraries serd and raptor2. Below are the dependencies for apt based Linux systems and rpm based systems.

For Debian/Ubuntu based systems:

apt-get install libtool automake autoconf libserd-dev libraptor2-dev

For Fedora

dnf install aclocal automake libtool serd-devel raptor2-devel

The minimum version of Serd is 0.28.0 (see hdt-cpp/README.md), which can be checked by the command serdi -v (requires installing the serdi package). This package has been tested with Serd 0.30.16.

1. 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

The HDT format is attractive for accessing large amounts of background RDF data. HDT is the basis for several companies that provide RDF technology at scale. Unfortunately the public version of the software is poorly maintained.

This pack is based on our fork of the hdt-cpp. The fork is mostly the work of Peter Ludemann, fixing several issues with modern C++ and libraries.

Notes

See also RDF basics wiki.

The hdt-cpp directory has a number of utilities in hdt-cpp/libhdt/tools. For details, see hdt-cpp/README.md:

• hdt2rdf
• hdtInfo
• hdtSearch
• modifyHeader
• rdf2hdt
• replaceHeader
• searchHeader

Contents of pack "hdt"

Pack contains 19 files holding a total of 61.4K bytes.