Re: Commutativity of SPDX expressions

J Lovejoy

Hi Richard,

Annex D explains the order of precedence for the operators and use of parentheses.

I admit, I find the use of parentheses easier to understand overall (than relying on remembering the order of precedence).

I’m not sure it explicitly states that "MIT AND Apache-2.0" is equivalent to "Apache-2.0 AND MIT” but I think that’s kind of implicit, no?

I also think this entire annex could use a re-write to make it a bit more user-friendly (on the topic of improving documentation…)


On Jul 17, 2022, at 12:21 PM, Richard Fontana <rfontana@...> wrote:

I'm working on some draft documentation for Fedora around use of SPDX
expressions in RPM spec file License: fields. I was surprised to
apparently not see anything in the SPDX spec that says that the AND
and OR operators are commutative. I want to assert that the expression
"MIT AND Apache-2.0" is equivalent to "Apache-2.0 AND MIT". Does the
SPDX spec actually take no position on this?


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