***CAUTION*** If you are installing over older version (below 0.50), you will need to re-create your storages (both DB_File and Postgres). ************* This is the README file for RDF::Core, a package for handling RDF data. 1. What is it RDF::Core? 2. Licensing 3. Warranty 4. Installation 1. What is RDF::Core? ======================================== RDF::Core is a pure perl implementation of RDF storage, parser, serializer and query. The storage functionality is basic - store, delete, query statements, where query means ask about existence or count or retrieve statements conforming given mask of (subject, predicate, object). Three storages are available - in memory, file (DB_File) and DBMS (PostgreSQL). The parser supports full RDF/XML syntax including aboutEach attribute (though it became obsolete). The serializer attempts to preserve anonymous nodes and to compact xml a bit grouping statements with common subject. The query language is rather focused on resources than on statements. The typical pattern is me->neighbor->child->age to express neighbour's children's age, not (me,neighbour, him) && (him, child, it) && (it, age, value). It contains some shortcuts to express things, that are (possibly) expressed often, like object->rdf:type = someClass. Functions are another enhancement of the language. They can be used instead of resource or property. Functions are implemented in a separated library, so that it's easy to create new or modify existing ones. Original creator of RDF::Core is Ginger Alliance (www.gingerall.com). 2. Licensing ======================================== RDF::Core is an Open Source project released under the MPL (Mozilla Public License). Alternatively you may use RDF::Core under the GNU's GPL license. Please, look at http://www.mozilla.org/MPL or http://www.gnu.org/copyleft/gpl.html for further info. 3. Warranty ======================================== We offer NO WARRANTY for using RDF::Core in any conditions. 4. Installation ======================================== You need XML::Parser, version 2.3 or above and URI 1.03 or above to install RDF::Core. Optionally you need DBI (1.14) if you want Postgres data storage and DB_File (1.72) for file data storage. perl Makefile.PL make test make make install (may require the root privileges) DBMS storage installation (optional): Create a PostgreSQL database. Load PL/pgSQL procedural language. Change working directory to ./dbmodel/pgsql Execute sql script in rdf-pgsql.sql Of course, we're not able to test it on all Unix machines, so if you meet any problem, feel free to contact us. GA rdf@gingerall.cz