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 for Data Definition Language
From The Free On-line Dictionary of Computing (30 December 2018) :

  Data definition language
     1. A language enabling the structure and instances of a
     database to be defined in a human-, and machine-readable
     SQL contains DDL commands that can be used either
     interactively, or within programming language source code,
     to define databases and their components, e.g. CREATE and
     See also Data manipulation language (DML).
     2. A specification language for databases, based on the
     entity-relationship model.  It is used in the Eli
     compiler-compiler to manage type definitions.
     ["DDL Reference Manual", ECE Dept U Colorado, 1991].

Contact=webmaster@dict.org Specification=RFC 2229