- One may want something like:
SELECT (a,b)
WHERE [?x 'parent' a] and [b 'brother' ?x]
- (i.e., ‘b is the uncle of a’)
- W3C started a standardization work in this area recently
- precise relationships to XML Query has to be defined
- concentrates also on protocols to extract subgraphs
- e.g., using SOAP
- Such facilities already implemented in Jena, RAP,…