Backward compatibility mechanism (achieved by the preserving of informationnot understood)

[Patrick Durusau <patrick@durusau.net>]

Greetings!

Can someone clarify the use case:

Backward compatibility mechanism (achieved by the preserving of 
information not understood)?

ODF already specifies that information that is not understood is to be 
preserved.

Or is this a case of where ODF defined an element and then later 
re-defined an element and metadata would signal which definition should 
be applied? And failing that, simply leave the element alone?

Thanks!

Hope everyone is having a great day!

Patrick

-- 
Patrick Durusau
Patrick@Durusau.net
Chair, V1 - Text Processing: Office and Publishing Systems Interface
Co-Editor, ISO 13250, Topic Maps -- Reference Model
Member, Text Encoding Initiative Board of Directors, 2003-2005

Topic Maps: Human, not artificial, intelligence at work!