I tried. Delegation relies on term_values which relies on OM, and this is (by design) not an OM data stream. 

I'm also working on the one busted test. 

> On Dec 5, 2013, at 9:55 PM, cjcolvar <notifications@github.com> wrote:
> 
> In app/models/derivative.rb:
> 
> > @@ -95,6 +96,14 @@ def self.create_from_master_file(masterfile, markup, opts = {})
> >      derivative
> >    end
> >  
> > +  def absolute_location
> Could this be done with delegation?
> 
> —
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