II_DML_DEF defines the default query language for an installation as SQL or QUEL. It is used in installations that support both the SQL and QUEL database languages, in which case one such language can be designated as the default. Applications-By-Forms, Ingres 4GL, and Report-By-Forms are parts of the Actian X tools that use II_DML_DEF. SQL is the default if this is not set. It can be set installation-wide or locally.