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I decided to add a Triple Store to the repository so that no data needs to be converted at the moment the converted data is accessed. This decision was done with the idea in mind that contents of repositories will much more often be read as changed. To avoid big changes in the core of DSpace and to make it easy to use dspace-rdf in existing repositories I decided that the Triple Store should extend the repository and not replace the relational database. The Triple Store can be considered as a cache for the converted data. Beside that it should be used to provide a read-only worldwide accessible SPARQL endpoint containing all converted data. The Triple Store should contain only data that is public as the access restriction of DSpace won't affect the SPARQL endpoint. For this reason dspace-rdf converts only archived, discoverable (non-privat) Items, Collections and Communities that are readable for anonymous users. Plugins converting Item metadata should check whether as specific metadata field needs to be protected or not (see org.dspace.app.util.MetadataExposure on how to check that).
Work in progress
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The following information will become part of this documentation as soon as they are ready. The following part of this document is work in progress and not finished yet. |
DSpace comes with Dublin Core as default metadata schema and contains several metadata fields out of the box. While new metadata schemas and fields can be added or existing once can be deleted many DSpace users will use the default metadata fields and extend them if necessary. This in mind we should create a default configuration to convert the default metadata fields of DSpace into RDF. This configuration can easily be adjusted to the special needs of a repository or extended to export local fields. Beside the metadata we should describe the repository itself in RDF and convert the structure of the repository (communities and collections) as well. The following part documents the default configuration of the rdf module.
Metadata Conversion
Describing the repository and its structure in RDF
To describe the repository and its structure (communities and collections) a DSpace Repository Ontology was created.