RE: graphic representation of relationships

In-Reply-To: <9106061844.AA27805@mcsun.EU.net>; from "Richard Donkin" at Jun 6, 91 6:20 pm > > --- Message ------------------------------------------------------------------ > > Incidentally, for producing Entity Relationship Diagrams, ERwin > > (from Logic Works, Princeton, NJ) is a reasonable, PC based tool. > > This tool is based on (and includes a good explanation of) the > > IDEF1X data modeling notation. IDEF1X is a standard that was published > > by the US Air Force in 1985. This is a good place to start for information > > about kinds of information & format for data models. > > > What kinds of things does IDEF1X cover? Is there any online info on it? > > Richard > The most direct way to answer is to give you the table of contents (below). I know of no online information - the only information I know of would be the standard itself and part 3 of the ERwin manual. TABLE OF CONTENTS ----------------- Section Title ------- --------------------------------------------------------------------- 1.0 Introduction 2.0 DATA MODELING CONCEPTS 2.1 managing data as a resource 2.2 the three schema concept 2.3 objectives of data modeling 2.4 the IDEF1X approach 3.0 IDEF1X SYNTAX and SEMANTICS 3.1 entities 3.2 connection relationships 3.3 categorization relationships 3.4 non-specific relationships 3.5 attributes 3.6 primary and alternate keys 3.7 foreign keys 4.0 MODELING PROCEDURES 4.1 phase zero 4.2 phase one - entity definition 4.3 phase two - relationship definition 4.4 phase three - key definition 4.5 phase four - attribute definition 5.0 DOCUMENTATION and VALIDATION 5.1 introduction 5.2 IDEF1X kits 5.3 standard forms 5.4 the IDEF model walk-through procedure APPENDIX A GLOSSARY APPENDIX B COMPARISON OF IDEF1X with IDEF1 APPENDIX C REFERENCES Greg Bryan Data Administrator DHL Systems Inc. San Mateo, CA 415-574-4197 gbryan@ssf-sys.dhl.com