The large efforts of Asian experts on character encoding and ISO/IEC JTC1/SC2 people made it feasible to interchange of multilingual character strings.
Some character strings configure a document logical elements; e.g., title, emphasized key word, note, etc. For easy human-readability and understandability of elements, some elements are rendered with their specific styles or layouts; e.g., rendered with large and bold fonts, rendered with italic fonts, rendered with indentation, etc.
See Example 1
Those human-readable documents are subjects to be interchanged between originator and recipient.