Compatibility guarantees for SQL states and messages

[David W. Van Couvering]

Hi, all.  I looked at the listing of Derby's public APIs (see 
http://wiki.apache.org/db-derby/ForwardCompatibility), and it mentions 
"Derby's JDBC support".

I need to delve in a little deeper.  Are we guaranteeing compatibility 
for the SQL States?  For the 10.2 release, is it OK for me to change the 
SQL State of an existing message, or do I need to keep it the same 
across minor releases?

What about the text of messages?  I noticed that we changed these 
between 10.0 and 10.1, so I'm assuming these can change across minor 
release boundaries.  What about across patch releases?

Thanks,

David