Diagnostic message, if inner declaration is missing
model World annotation(defaultComponentName = "world", defaultComponentPrefixes = "inner replaceable", missingInnerMessage = "The World object is missing"); ... end World;
annotation"(" missingInnerMessage "=" STRING ")"
When an outer component of the class does not have a corresponding inner component, the string message may be used as a diagnostic message. However, the inner component is automatically added - if unique - regardless of this annotation.