It's simply not there. I'm willing to concede we are not, though. I don't understand this. This seems like a strawman though. No one here afaik has said anyting about zero, one, or many sample documents.
Every project redefines entities.
That's kind of the point. No, there are some constraints, but I think they are fairly minimalistic. Also, authors are not the only stakeholders in a document. I am only proposing we hold off on some parts. No one denies that, afaik.