Re: Confused...

[Andrew Josey <yyyyyy@xxxxxxxxxxxxxxxxx>]

XSI is an upward compatible superset. We require systems implementing
XSI to conform to the core POSIX requirements. The exact tie in,
is in the Base Definitions volume under Conformance.

The rationale may be helpful
http://www.opengroup.org/onlinepubs/007904975/xrat/xbd_chap02.html

regards
Andrew

On Mar 13,  6:18pm in "RE: Confused...", Graham Greene wrote:
> Thanks for clearing that up, I'm less confused now....
> 
> Can you also explain how XSI fits into the big picture? 
> The definition page has:
> "
> XSI
> The X/Open System Interface is the core application programming
> interface for C and sh programming for systems conforming to the Single
> UNIX Specification. This is a superset of the mandatory requirements for
> conformance to IEEE Std 1003.1-2001.
> "
> Does that mean that XSI is not required to be POSIX conformant? 
> Is is accurate to say "XSI is a POSIX extension and not part of the core
> POSIX standard"? Or what?
> 
> Graham Greene
>