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An external value is an expression whose value is obtained from the command that invoked the processing of the current project file (typically a gnatmake command).
Syntax:
external_value ::=
external ( string_literal [, string_literal] )
The first string_literal is the string to be used on the command line or in the environment to specify the external value. The second string_literal, if present, is the default to use if there is no specification for this external value either on the command line or in the environment.