Admittedly, the term semi-structured data can mean different things in different contexts. For
example, for relational databases it refers to data that can’t be stored in rows and columns. This
data must, instead, be stored in a BLOB (binary large object) a catch-all data type available in
most DBMS software. Dealing with unstructured data requires classification and taxonomy.
[Blumberg and Atre, 2003c]