Occurrences of associations?

[Richard Light <richard@light.demon.co.uk>]

Hi,

Thinking about the application of XTM to museum database information, it 
occurs to me that you can extract assertions such as "John Brown was 
born in Birmingham on 3 May 1852" or "this object was excavated from NGR 
0045 8542 by John Brown on 25 July 1885".  I would expect to model these 
assertions in my XTM as Associations.  (The Topics would be "John 
Brown", "Birmingham", etc.)

However, the lack of "Occurrence*" within the Association content model 
means that I have no means of linking to the source which provides the 
basis for this assertion.

What is the prevailing wisdom on this situation?  Should I be modelling 
my information differently?

Richard Light
-- 
Richard Light
SGML/XML and Museum Information Consultancy
richard@light.demon.co.uk