Architectural Principles Domains

PPDM uses two kinds of domains

1. The PPDM Meta model allows columns to be grouped into logical sets based on the type of value contained by the column. For example, a Meta Model domain might group all Latitude and Longitude values.

1. The CASE tool allows CASE domains to be defined; they can be used to ensure consistent usage of column format and size in the model.

Objectives

1. Meta model domains are usually created by implementation teams based on their needs.
2. Use of CASE domains greatly facilitates the process of ensuring column name and format consistency during the data modeling process.
3. CASE Domains are to be established whenever common attribute fields are used repetitively throughout the model.
4. CASE domains are to be used as appropriate in all discipline areas of the model.

Guidelines

1. For a list of domains in current use, contact the PPDM office. Appendix B contains a snapshot of domains in use for version 3.8 of the Data Model.
2. Existing domains should be used when possible. There should be one Lat/Long domain, for example.
3. Additional domains should be established as needed.
4. New domains should be communicated with all work groups.

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