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. Therefore, it is also known as schemaless or self-describing structure.
In the semi-structured data, the entities belonging to the same class may have different attributes even though they are grouped together, and the attributes' order is not important.
Semi-structured data is increasingly occurring since the advent of the Internet where full-text documents and databases are not the only forms of data any more and different applications need a medium for exchanging information. In object-oriented databases, one often finds semi-structured data.
Read more about Semi-structured Data: Types of Semi-structured Data
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