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Discrepancy between WixVariable documentation and behavior #5742
According to documentation (http://wixtoolset.org/documentation/manual/v3/xsd/wix/wixvariable.html) WixVariable value cannot be an empty string. Setting WixVariable to empty string does not result in an error (WiX Toolset v188.8.131.521).
Personally, I would like to be able to set WixVariable to an empty string.