[Tagdb] Over tagging fields?

[Joshua Lippiner]

Hello All,
 
I am new to this group and checked the archive but didn't really find any
direct answers to this question:
 
In Web 2.0 Applications, should any group of items ever have more then one
tag field?
 
In the last post, Colin mentioned tags for articles, sponsors and products.
It made me start wondering about rules for too much tagging.  As an example,
take book cataloging.  When developing a tag system for books should you
only allow tags on the book level or should you also allow tags at the
author level?  Doing both would allow users to describe a book AND authors
separately but then how do you deal with tag searching?  Does the user have
to specify that they only want to search the book tags or author tags or do
you search everything together?  
 
Before figuring out the schema for my tagging system, I need to figure out
this more fundamental issue.  It seems it is a critical aspect of Web 2.0
tagging applications.   
 
What is everyone's thoughts on this?
 
Thanks,
 
Josh
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