I want to assume that if we had versioning built into more of our common languages and runtimes (some do), than this would not be an issue. Also, I hate to nit

I want to assume that if we had versioning built into more of our common languages and runtimes (some do), than this would not be an issue. Also, I hate to nitpick, but protocols usually describe stuff like how to drink tea formally in a garden with a king or queen (workflow), not API's (implementation). I think what they mean is URL naming scheme, but I could be wrong.