Integrated Information Support System (IISS). Volume 5. Common Data Model Subsystem. Part 37. DDL to NDDL Translator User's Manual.

摘要

The NDDL Translator is a utility for translating the native Data Definition Language (DDL) for DATABASE 2 and TOTAL datd base management systems into the IISS Neutral Data Definition Language (NDDL) for the creation of the Internal Schema (IS) specification for the Common Data Model (CDM). The NDDL Translator consists of several translators, one for each DDL which must be translated to NDDL. Each translator differs only in its lexical analyzer and parser; so to avoid confusion this document will refer to these translators collectively as 'the translator'. The translator accepts the subset of the native DDL which pertains to initial database definition. While all of the subset is accepted, only entities within the subset which have NDDL equivalents are translated (e.g. defining a file of a database is translated but the type of disk drive is accepted and ignored). The translator checks the syntax of the input but assumes the semantics are correct for the appropriate DDL.