Constraint-based Search Techniques for RDF
Castor is a protoype SPARQL engine embedding a specialized lightweight constraint programming (CP) solver. It implements most of the SPARQL 1.0 specification. Currently, queries are performed on read-only datasets created from RDF graphs in a pre-processing step.
The ideas implemented here are described in the following publications:
- le Clément V., Deville Y., and Solnon C., An Efficient Light Solver for Querying the Semantic Web, International Conference on Principles and Practice of Constraint Programming (CP), 2011.
- le Clément V., Deville Y., Solnon C., and Champin P.-A., Castor: a Constraint-based SPARQL Engine with Active Filter Processing, Extended Semantic Web Conference (ESWC), 2012.
This project uses the following freely available libraries.
- Raptor for parsing RDF graphs,
- Rasqal for parsing the SPARQL syntax,
- PCRE for handling regular expressions,
- Mongoose (embedded, see
thirdparty/mongoose) for the HTTP end-point, - Google Mock and Google Test (embedded, see
thirdparty/googlemock) for unit testing.
You will also need CMake and a C++11 compiler.
To build Castor, run
mkdir build && cd build
cmake ..
make
Various build options are available. You can specify them on the command line
of cmake or use an interface like ccmake to select them.
The following binaries are placed in build/bin.
| Program | Description |
|---|---|
| castor | Run a single query |
| castord | Simple SPARQL HTTP end-point |
| castorld | Convert an RDF graph to a Castor dataset |
| dbinfo | Introspect a Castor dataset |
Run a program without arguments for help about its usage.
Author: Vianney le Clément de Saint-Marcq vianney.leclement@uclouvain.be
Copyright 2010-2013 Université catholique de Louvain
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 3 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.
Please refer to the LICENSE file in the subfolders of the thirdparty folder
for licensing information of third-party software used by this project.