1. Dynamic Data Library - the programmy modules MS Windows containing feasible codes or data which can be caused during execution of applications or others DDL.
2. Data Definition Language is a data definition language. The specialized language used by the user or the database manager for determination of a logical structure of data (DB objects: fields of records, their attributes and properties). Commands of language DDL are processed by the DDL compiler and transferred to execution.
3. Data Description Language is a data description language.
4. Document Description Language is language of the description of documents.