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Although in general the expression “$foo == namespace.$foo” is true, there is one exception: When library parameters are evaluated in the referencing cue, variables are resolved using the parent’s namespace. However, the referencing cue creates a new namespace, so the namespace keyword already points to the library, not to the parent’s namespace. Example:

<cue name="LibRef" ref="Lib">
  <param name="Param1" value="$foo" /> <!-- $foo from parent namespace -->
  <param name="Param2" value="namespace.$foo" /> <!-- LibRef.$foo (error) -->
https://forum.egosoft.com/viewtopic.php?t=363625</cue>