GDML (Groton Data Manipulation Language)

GDML, or Groton Data Manipulation Language, is a relational language designed to be written and read by people, like SQL. GDML is the original language of Interbase and still it's supported through an utility known as QLI. It's the equivalent of DML in SQL, although it exhibits some capabilities of DDL.

(Now outdated and no longer in use.)

Source: https://www.cvalde.net/document/glossary.html