[Openid-specs-fapi] "SHALL" vs. "MUST"

Brian Costello BCostello at yodlee.com
Wed Dec 7 20:06:34 UTC 2016


Must I be worried about it?

-----Original Message-----
From: Openid-specs-fapi [mailto:openid-specs-fapi-bounces at lists.openid.net] On Behalf Of Mike Jones via Openid-specs-fapi
Sent: Tuesday, December 06, 2016 1:30 PM
To: Preibisch, Sascha H <Sascha.Preibisch at ca.com>; Financial API Working Group List <openid-specs-fapi at lists.openid.net>
Subject: Re: [Openid-specs-fapi] "SHALL" vs. "MUST"

"SHALL" means exactly the same thing as "MUST", per RFC 2119.  It's "SHOULD" and "MAY" that you should be worried about. ;-)

				-- Mike

-----Original Message-----
From: Openid-specs-fapi [mailto:openid-specs-fapi-bounces at lists.openid.net] On Behalf Of Preibisch, Sascha H via Openid-specs-fapi
Sent: Tuesday, December 6, 2016 9:01 AM
To: Financial API Working Group List <openid-specs-fapi at lists.openid.net>
Subject: [Openid-specs-fapi] "SHALL" vs. "MUST"

Hi all!

I just had a chat with a colleague and he said:

- you know Sascha, I hate to read 'shall' in specifications. I then never know if a product supports it

So my question is: what is the reason for using "shall" instead of "must"?

Thanks,
Sascha

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