implementation issues

[John Fuller <jfuller@wernervas.com>]

when creating an instance I see the format allows multiple names, 
subjects and descriptions,
and list instance responses allow multiple name, subject, priority?
In the creation case, Is it really necessary to have multiples for all 
of these?
In the list case, would there really be multiple priorities for the 
same instance?

(Editorially, priority is an int in the schema, but undefined in the 
spec.)