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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. |
Information Builders |