Olaf Hartig has pointed me to the R2R Framework :
The R2R Framework enables Linked Data applications which discover data on the Web, that is represented using unknown terms, to search the Web for mappings and apply the discovered mappings to translate Web data to the application's target vocabulary. The R2R Framework is aimed to be used by Linked Data publishers, vocabulary maintainers and Linked Data application developers. It support them by:
1. providing the R2R Mapping Language for publishing fine-grained term mappings on the Web
2. defining best-practices on how mappings can be discovered by Linked Data applications
3. providing an open-source implementation of the R2R Mapping Engine.