Bigdata SQL: Semi-Structured Data

Any data that is not organized as a proper data structure but has associated information,  such as metadata, embedded inside is called semi-structured. In semi-structured data, a schema is contained within the data and is called self-describing. Much of the data on the Web is semi-structured, such as XML, JSON, YAML and other markup languages, e-mail data, and Electronic Data Interchange (EDI).