This RDF low-level module has been created after two year
experimenting with a plain Prolog based module and a brief evaluation of
a second generation pure Prolog implementation. The aim was to be able
to handle up to about 5 million triples on standard (notebook) hardware
and deal efficiently with subPropertyOf which was
identified as a crucial feature of RDFS to realise fusion of different
data-sets.
The following issues are identified and not solved in suitable manner.
subPropertyOf of subPropertyOfsubPropertyOf, it is likely to be profitable to
handle resource identity efficient. The current system has no support
for it.