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There are several facilities that support a running Fedora repository. Each of them may be supplied by prepackaged default tools, or by externalized replacements. Which to use for your installation depends on your local situation as well as what you expect to do with your repository. The Resource IndexThe first question to ask about the Resource Index is whether or not you want to enable it at all. The Resource Index provides for fast SPARQL/iTQL/SPO queries against the graph of objects in your repository. Some advanced features of the Fedora platform depend on its availability, such as RDF-based queries to supply resource attributes for making policy-based access decisions. If you are not using these advanced features, and you do not expect to offer access to the RDF graph of your repository as a service, then you may wish to turn of the Resource Index, which you can do as an option in the Fedora installer. If you do decide to enable the Resource Index, you may either use the prepackaged Mulgara triplestore, or you may supply an external triplestore to your repository. Trippi, the Fedora API for accessing triplestores, currently supports Mulgara and MPTStore. |