XML best practices

I'm wondering if it would be useful to put a few "notes for authors"  
in the XML serialization.

E.g., common things like:
	It's good to use a local copy/cached of the schema
	It's not required to have all the schema junk in the ontology root
		Indeed, I think I'd like to take that out of the example

Thoughts?

Cheers,
Bijan.