1.3 Namespace: compatible extensions?

Greetings!

Under 1.3 Namespace we say:

> Implementations may also accept formula syntaxes other than 
> OpenFormula, and they may accept various compatible extensions to the 
> default OpenFormula syntax.
How would we judge a compatible extension?

Or was it meant to say:

"...they may accept extensions to the default OpenFormula syntax." ?

That would parallel the first part of the sentence.

I assume like OpenDocument, where OpenFormula provides a function that 
should be used in preference to an extension. That is to say that 
extensions are for going beyond OpenFormula and not replacing it.

Hope everyone is having a great day!

Patrick

-- 
Patrick Durusau

Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)