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The files [dspace-install]/config/modules/rdf/metadata-*.ttl configure the MetadataConverterPlugin. This is the plugin that converts Item's metadata. The file metadata-prefixes.ttl can be used to specify prefixes (or namespaces) to be used in serializations of RDF that support such mechanism (g.e. Turtle or RDF/XML). The file metadata-rdf-schema.ttl is not a configuration file. It contains the schema describing the vocabulary used for the configuration of the MetadataConverterPlugin. The file metadata-rdf-mapping.ttl contains several mappings between metadata fields and triples that should be created to represent the specified metadata field. It already contains some examples which should help until it is better documented. The triples that should be created while converting a metada field are specified using RDF reification. You can specify regular expresions to create some triple only for metadata fields those values fulfils the specified regular expression. Two more regular expressions can be used to manipulate field values before they will be used to generate Literals or URIs. The file metadata-rdf-mapping.ttl already contains examples on how to generate URIs and Literals using metadata field values. When the metadata-rdf-mapping.ttl is loaded simple inferencing is used to detect most of the types of its entities. So you do not need to type every resource. Typing (by using statements with the property 'rdf:type' or the turtle shortcut 'a') is necessary for URIGenerators ResourceGenerators and LiteralGenerators only as there is no way to distinguish them using inferencing.
Creating Links
Links makes Linked Data out of RDF. Links can be created in dspace-rdf using ResourceGenerators in the
RDFizer
The RDFizer is a command line interface administrators can use to convert the complete repository contents, some content specified by its handle or to delete data from the Triple Store. If the Triple Store is reachable the RDFConsumer converts data at the moment it is changed within DSpace so that the Triple Store should stay synchronized with the repository. You can get the online help by executing the following command:
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