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AutoGen has two types of expressions: full expressions and basic ones. A full AutoGen expression can appear by itself, or as the argument to certain AutoGen built-in macros: CASE, IF, ELIF, INCLUDE, INVOKE (explicit invocation, see section 3.6.16 INVOKE - Invoke a User Defined Macro), and WHILE. If it appears by itself, the result is inserted into the output. If it is an argument to one of these macros, the macro code will act on it sensibly.
You are constrained to basic expressions only when passing arguments to user defined macros, See section 3.6.4 DEFINE - Define a user AutoGen macro.
The syntax of a full AutoGen expression is:
[[ <apply-code> ] <value-name> ] [ <basic-expr-1> [ <basic-expr-2> ]] |
How the expression is evaluated depends upon the presence or absence
of the apply code and value name. The "value name" is the name of
an AutoGen defined value, or not. If it does not name such a value,
the expression result is generally the empty string. All expressions
must contain either a value-name or a basic-expr.
3.3.1 Apply Code 3.3.2 Basic Expression