> In fact, I'll go so far as to say that it does NOT make sense. SGML goes
> *too far* in this direction: the ID/IDREF mechanism should be treated at a
> separate level, like other integrity constraints.
IMHO the purpose of ID/IDREF is to express non-hierarchical data using
hierarchical notation. Appropriate use of ID and IDREF attributes
allows the representation of any directed graph, whether acyclic or
cyclic.
-- John Cowan cowan@ccil.org e'osai ko sarji la lojban.xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@ic.ac.uk Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@ic.ac.uk the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)