OpenCDISC Validator question

Hi All

When readying the Using OpenCDISC Valiudator topic and reading the text below

 Select your format: "SAS Transport (XPORT)" or "Delimited Text". If you selected "Delimited", you can specify a Delimiterand a Qualifier. The default delimiter is a "|" (vertical pipe).

I was wondering what was meant as a 'Qualifier'.

Thanks for any help given

Chris