Wrapper components

Wrappers convert multimedia data sources into Web-accessible mediaspaces. They expose the media objects descriptive metadata as RDF and provide access to these metadata via a SPARQL query interface. Additionally, they expose the structural and semantic definitions of the metadata, i.e. schema information. Since the metadata are available in RDF, and RDF is a self-describing data model, schema information is attached to the data and retrievable via the SPARQL interface.

OAI2LODServer

The OAI2LOD Server exposes any OAI-PMH compliant metadata repository according to the Linked Data guidelines. This makes things and media objects accessible via HTTP URIs and query able via the SPARQL protocol. Part of the OAI2LOD architecture, especially the front-end, is based on the D2R Server implementation.

Mediator components

Mediators take SPARQL requests from end user applications, reformulate them according to pre-defined mapping specifications, forward the request to known wrapper components and return the query results to the end user application.

Mapping Tool

A Mapping tool will support experts in the mapping specification process and provide means to deploy mediator components which in turn can also be accessed via SPARQL.