Well, they would be most appropriately dealt with through consultation with the industry. I'm not a specialist in defining those terms, because they are in fact terms that are industry-based. What would have made a lot of sense...and although it's not the most efficacious way of approaching the issue, perhaps you can deal with the issue through regulation as well, but it's not a great way of doing it, from a legalistic point of view. Consultation with the industry...I don't have a list of softwood lumber definitions for you, for example.
On October 31st, 2006. See this statement in context.