Syntax:
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{IF::Tag name::Tag value::true::false}
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Function:
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If there exists a tag with the specified tag name (argument 1) and value (argument 2),
then follow the instructions of the next argument ("true") and if not, then follow the
instructions of the argument "false"
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Example:
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{IF::ANYTAG::hello world!::hallo welt!::this tag does not exist!}
If ANYTAG exists and has "hello world!" as value, PReP will output "hallo welt!" - otherwise
it will return "this tag does not exist!".
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