The (semantic) web is one of the most promising application areas for
SWI-Prolog. Prolog handles the semantic web Resource Description Framework (RDF) model naturally, where
RDF provides a stable model for knowledge representation with shared
semantics. Prolog is also quite capable of providing
Below are the most vital packages for programming web services and RDF
- Web server and client library
Core web package. Provides an HTTP server and client, session
handling, authorization, logging, etc. Libraries are also included for generating
- RDF storage and query library
Load/save RDF and query it. The library loads and saves XML/RDF
and Turtle. Its database scales to approx. 20M triples on 32-bit
hardware and 300M triples on a 64-bit machine with 64 Gb memory.
Also provides simple RDFS and OWL support.
The GIT version in the development tree has been updated
to version 3.
- Spatial indexing library
SWI-Prolog interface to Spatial Index and GEOS libraries, providing
spatial indexing of URIs. Supports import and export to GML, KML,
and RDF with GeoRSS Simple, GeoRSS GML, and W3C WGS84 vocabulary
This package is provided in the source, but not
(yet) in the binary distributions. The source contains
instructions for building the dependencies and the indexer itself.
Separately distributed packages
Some packages are distributed separately.
- The ClioPatria semantic search web server
This library provides a ready-to-run web server that includes a
SPARQL endpoint, user rights management and RDF development tools.
ClioPatria is an RDF-application development framework.
- Thea, an OWL library for SWI-Prolog
Provides access to OWL ontologies at the level of the abstract
syntax. Can interact with external DL reasoner using
DIG. The project is hosted on
GitHUB. See also
Blip Blog, Logic Programming in Biology
- The Triple20 ontology editor
Graphical tool for browsing and editing ontologies. Not very well
maintained, but useful for browsing loaded RDF and it has two nice
features: it scales well and it can handle multiple ontologies and
allows for editing them in a unified view.
- See also
- - Publications
- - documentation overview
- - Topos: A Semantic Web, Linked Data application
- - DBTune blogs tagged SWI-Prolog