responsibility and association

Hi,

the current DM describes both association and accountability using "responsibility" in sec. 2.3: 
http://dvcs.w3.org/hg/prov/raw-file/default/model/prov-dm.html#section-agents-attribution-association-responsibility

This makes the use of the term "responsibility" potentially unclear, namely:

" Agents are defined as having some kind of responsibility for activities."
and
" An activityassociationis an assignment of responsibility to an agent for an activity, indicating that the agent had a role in the 
activity."

and later:

" Responsibilityis the fact that an agent is accountable for the actions of a "subordinate" agent, in the context of an activity."

so the former uses responsibility to define association, without reference to other agents, while the latter uses the same term 
effectively to introduce actedOnBehalfOf, which has to do with "chains of responsibility".

I suspect readers may be confused by this. Any thoughts on how to resolve this?

-Paolo


-- 
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Paolo Missier - Paolo.Missier@newcastle.ac.uk, pmissier@acm.org
School of Computing Science, Newcastle University,  UK
http://www.cs.ncl.ac.uk/people/Paolo.Missier