Which data format is structured by white space?

YAML Ain't Markup Language (YAML) is a white space–structured file that is also used to store data for the interchange of information. JavaScript Object Notation (JSON) is structured with curly and square brackets. Extensible Markup Language (XML) was adopted from Hypertext Markup Language (HTML), which uses opening and closing tags. Comma-separated values (CSV) is a flat data storage method that uses commas to delimit the fields of information held on each line.