just another standards question

I'm about finished with indicator variables. They seem to work well with
output variables as well as with input variables in insert statements.

Now the one question: Informix and Sybase have three different settings for
indicator variables:

-1 means value is null
0 means value is okay
> 0 means value is okay, but string was truncated to n bytes

I tried Oracle but apparently they just use 0 and -1. Does the standard say
anything about this?

BTW is this SQL standard on-line anywhere? A WWW page maybe?

Michael
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