Semi-structured data

From Science Europe Data Glossary

Definition: Semi-structured data is a form of structured data that does not conform with the formal structure of data models associated with relational databases or other forms of data tables, but nonetheless contains tags or other markers to separate semantic elements and enforce hierarchies of records and fields within the data.
Explanation: It is also known as self-describing structure.
Reference: https://en.wikipedia.org/wiki/Semi-structured_data
See also: Structured data