Introduction

The Relation Tool can manage several and different kinds of graphs representing labeled relations between objects.

Currently, graphs supported are:

• simple IOBTrees managing relations between integer unique identifiers and tuples of integer unique identifiers. This is the historical relations management, useful to store relations between CPS documents, using their docid in the repository as unique integer identifiers.
• rdflib graphs managing RDF graphs provided by rdflib.
• Redland graphs managing RDF graphs provided by Redland using the python binding.

Relation tool API

The relation tool methods include the following features:

• graphs management (add/delete/get graphs)
• relations management (add/delete relations)
• graph queries (only for Redland graphs)