A programming language is not a plan specification. A plan specification can be copied, but a programming language has an infinite number of potential strings. How could such a thing be copied?

I suggest the term be changed to 'programming language expression', since particular expressions of a programming language can be copied.

I haven't seen any conversation about this. As it stands, IAO's classification of a programming language is not correct. If folks disagree with this, I would to hear from them.