This protection could be implemented with a regular expression,
or using another solution (as manual parsing).
Also, when a protection detects an issue, instead of returning empty string,
it returns Void. If the value is a multiple string value, if an item is detected for an issue,
the returned multiple string value is now Void.
This abstraction will allow to return either Void, or a "corrected" value,
for instance the string value, without the detected "<script..>..</script>" text.
TODO: improve the WSF_PROTECTION_REGEXP to allow replacement strategy.
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