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A prototype SPARQL engine embedding a specialized lightweight CP solver.

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Castor

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:

Prerequisites

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.

Building

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.

Running

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 and license

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.

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