RDF Use Cases in Xcerpt
At the start of the W3C activity on standardizing a query or data access language for RDF, a set of use cases for such a language has been published. We have started implementing some of these use cases in Xcerpt, as described in the following. The RDF Data Access Use Cases and Requirements specification contains a number of use cases for RDF query (or data access) languages. These use cases are, however, notably different from the ones published by the W3C for XML Query: The XML Query use cases are rather precise, defining both input data and desired output. In contrast, the RDF use cases are far less precise, often rather vague descriptions of settings and application scenarios and are interspersed with irrelevant information. Nevertheless, we have started to implement some of these while also developing a (small) number of our own use and demonstration cases more in the spirit of the XML Query use cases.
At http://svn.amachos.com/xcerpt/applications/2005/use-cases/ you can find two of these use cases as Xcerpt programs, a few more are described in Oliver Bolzer's master thesis.
We plan to add further use cases in the future, for more information contact Benedikt Linse or ask at our development mailing list.