Re: Alternative approach for key/keyref

James Clark wrote:

> I was thinking of the issues in the paper by Wenfei Fan and Leonid Libkin
> "On XML Integrity Constraints in the Presence of DTDs". See
> 
> http://www.cis.temple.edu/~fan/publication.html

Issues in this paper are just difficult, even when we do not 
have path expressions at all.

Cheers,

Makoto