[sc34wg3] XTM 2.0 topicRef - proposal for an erratum

[Steve Pepper]

* Lars Heuer
|
| > But all three are backward compatible, right?
| 
| You can parse XTM 2.0 topic maps with an XTM 2.1 parser but you cannot
| read XTM 2.1 topic maps with a 2.0 parser.

I don't care so much about the parser. My concern is for the validity of
existing topic maps. I would not want to see a change that rendered 2.0 topic
maps invalid, but as long as a 2.0 topic map is regarded as valid by an 2.1
parser, we have the backwards compatibility I care about.

Steve