Re: What are the problems with IDML?

Marc Salomon said"

> The issue of classifying metadata for arbitrary objects is a problem already
> solved by the library community and is orders of magnitude less complex than
> specifying content models for arbitrary document forms.

While I will agree that the library community has done some interesting
things with information classification in general, I have yet to have
seen a good library taxonomy for products and services let alone
a full description of associated metadata. If you know of something
that I have missed, I would love to hear about it. 

> But <META> is only going to scale for the most lightweight metadata
> applications, and for more complex collections, first-class metadata objects
> will be the answer.

Can you please explain a little more about "first-class metadata
objects" and how they differ from <META> and who is work on those
strategies right now?