I cannot find a discussion of the meaning and use of Declarative Referential Integrity (DRI) in the on-line docs ToC or Index. Please tell me in which chapter/section this is covered. Thanks, Rich -- Richard B. Shepard, Ph.D. | The Environmental Permitting Applied Ecosystem Services, Inc. | Accelerator(TM) <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863