Add RFC 2119 key words to preamble (modelica#584)

APillekeit · Jun 26, 2019 · eb64fb3 · eb64fb3
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diff --git a/docs/0___preamble.adoc b/docs/0___preamble.adoc
@@ -187,3 +187,5 @@ used to define the sparseness structure of partial derivative matrices).
 In order to access an array element the C convention is used.
 For example,
 the first element of input argument `x` for function `setContinuousStates` is `x[0]`.
+
+* The key words *MUST*, *MUST NOT*, *REQUIRED*, *SHALL*, *SHALL NOT*, *SHOULD*, *SHOULD NOT*, *RECOMMENDED*, *NOT RECOMMENDED*, *MAY*, and *OPTIONAL* in this document are to be interpreted as described in https://tools.ietf.org/html/rfc2119[RFC 2119].