Jeni's Musings

To quote:

The reason that this is unacceptable is that reified statements aren’t incorporated into triplestores in the same way as normal statements, so you can’t query as naturally on these statements as you can on unreified statements. It’s even more of a problem when some of the triples are reified and some aren’t.

I believe this is a problem with the triple stores and not necessarily RDF. Although an RDF document may have mixed reified triples and normal triples, the store can reify all non-reified triples and insert a normal triple for every reified triple. After this simple parsing, what is the issue? I do not know about SPARQL making it difficult to deal with reification, but it seems that RDF is expressive enough to deal with this.

Nonetheless, reification is pretty annoying with RDF.