From bb5b58e7512bb3be4d7784f6f5f300a100bc91e0 Mon Sep 17 00:00:00 2001 From: Hans Olsson Date: Fri, 10 Dec 2021 09:01:54 +0100 Subject: [PATCH] Update chapters/unitexpressions.tex Spelling out the decision. --- chapters/unitexpressions.tex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/chapters/unitexpressions.tex b/chapters/unitexpressions.tex index 4cda64911..d98b00ef4 100644 --- a/chapters/unitexpressions.tex +++ b/chapters/unitexpressions.tex @@ -62,7 +62,7 @@ \section{The Syntax of Unit Expressions}\label{the-syntax-of-unit-expressions} \end{lstlisting} A \lstinline[language=grammar]!unit-symbol! is a non-empty string of \lstinline[language=grammar]!unit-char! characters. -The set of allowed characters is currently not defined, but it is recommended to only use \lstinline[language=grammar]!NON-DIGIT!. +These are restricted to \lstinline[language=grammar]!NON-DIGIT! characters. It is required that basic and derived units of the SI system are recognized, but tools are allowed to additionally support user-defined unit symbols. The required unit symbols do not make use of Greek letters, but a unit such as $\Omega$ is spelled out as \lstinline!"Ohm"!. Similarly degree is spelled out as \lstinline!"deg"!, both on its own (for angles) and as part of \lstinline!"degC"!, \lstinline!"degF"! and \lstinline!"degRk"! for temperatures (Celsius, Fahrenheit and Rankine).