About Simple Types

Comments:

For XML Schema, I think it is equivalent to context free grammar, CFG. So the simple types should be regular expression for defining tokens in language, complex types should be BNF productions. Both regular expression and BNF or CFG are well defined and concise. Why don't we adopt and standardize them? 

The central task, I think, is to make XML schema shorter/concise and expressive as CFG using known terms.

I have a feeling of standard/specification/recommendation and/or term explosion.

Thank you for consideration.

Thomas Li, Ph. D.

Corporola Inc.