Dictionary Components - HP DDL D40 Reference Manual

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Dictionary Database Structure
A DDL dictionary is itself a DDL database consisting of 14 files. DDL supplies the
names of the dictionary database files; these names must not be changed.
This appendix describes the structure of the dictionary database in detail, covering the
following topics:
Basic components of a dictionary: objects, elements, and text items
Files that make up the dictionary database: their names, their structure, and what
they contain
Fields in each file: their names, data types, sizes, and functions
Object storage in the dictionary
Possible database links between dictionary files
Note. Information in this appendix is not guaranteed to remain the same or to change in
compatible ways from release to release.

Dictionary Components

A DDL dictionary deals with three basic components: objects, elements, and text
items.
An object can be a single element, as in the case of a single-field definition or a
constant, or a group of elements, as in the case of a record, a group definition, or a
token map.
The DDL compiler manages six kinds of objects:
Constants
Definitions
Records
SPI token types
SPI token codes
SPI token maps
DDL can add these objects to and delete them from a dictionary, as well as perform
other operations on them.
If a DDL dictionary is part of a Pathmaker application catalog, the Pathmaker product
can store additional objects in the dictionary. The Pathmaker product manages four
kinds of objects that it can store in a DDL dictionary:
Servers
Services
Requesters
Screens
Data Definition Language (DDL) Reference Manual—426798-002
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