Partitioned data sets

GDDM V3R2 Base Application Programming Guide

Partitioned data sets

GDDM V3R2 Base Application Programming Guide
SC33-0867-01

Partitioned data sets are used by GDDM for:

Image Symbol Sets (ISS), Vector Symbol Sets (VSS), by calls to GSLSS, PSLSS, PSLSSC, SSREAD, and SSWRT, and also by using the Image Symbol Editor.
Device-dependent pictures by calls to FSSAVE, and FSSHOW.
CGM conversion profiles.
GDDM-IMD-generated mapgroups, as required by calls to MSPCRT, MSQADS, MSQGRP, MSQMAP, and MSREAD.
Graphics data format (ADMGDF) files, as required by calls to GSLOAD and GSSAVE.
4250 printer typographical font and code page data, as required by calls to GSCPG and GSLSS.
Computer Graphics Metafile (CGM) as required by calls to CGLOAD.

GDDM maintains symbol sets, pictures, generated mapgroups, and ADMGDF files as members of partitioned data sets. The member-names that GDDM uses are those specified in the corresponding GDDM calls as "symbol-set names", "picture-names", "group-names", and "names" subject to modifications of these names by any character-substitution rules that apply.

The use of partitioned data sets containing symbol sets, pictures, generated mapgroups, and ADMGDF files can be controlled by the ESLIB routine whose syntax is described in the GDDM Base Application Programming Reference book. This routine establishes the set of partitioned data sets that are to be used to store or retrieve a given type of object. The partitioned data sets used are identified to this routine by a list of file names.

The partitioned data sets allocated to the specified file names are searched in the order given to try to find an object. An object is stored only using the first file name of the list, even though it may have been retrieved from another one. If no file name list is provided, only the default file name is used for retrieving and storing GDDM objects.

GDDM ensures the integrity of partitioned data sets as they are written to.

The Interactive Chart Utility (part of GDDM-PGF) includes a directory function that supports list, delete, and copy operations on GDDM objects such as symbol sets, pictures, generated mapgroups, and ADMGDF files.

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