Re: ACTION-555: Proposed change to petnames

> > code> <bibref ref="ref-effective"/>.  Implementations that use such 
> > suffixes for other security decisions (e.g., to determine the 
> > shortest possible suffix that  <code>document.location.href</code> 
> > can be shortened to) should use the same mechanism to determine the 
> > suffix to which a petname can be bound.

A nit, but do we want to avoid "should" as a natural language term? In 
which case, would we say "are encouraged to"?