The description of an IDMS data source
is contained in a pair of simple
comma-delimited sequential files: a
Master File, and an associated Access
File. The Master File defines the field
names for IDMS fields and segment
relationships. The Access File is an
extension of the Master File that
provides additional information needed
to retrieve data from IDMS data sources.
The Access File provides information
needed to map DML record-types and
LRF-based records, including record and
area names and, where needed, set or
field name information.
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