About the Author
David Arctur is a product specialist at ESRI and is part of the geodatabase development team. He has written for the "Earth Observation & Mapping Magazine," "IEEE Computer Magazine," and "International Journal of Geographical Information Science," He lives in Austin, Texas. Michael Zeiler is a technical writer and data model specialist at ESRI with experience in diagramming GIS concepts, building data models, and programming. He is the author of "Exploring ArcObjects," "Inside ARC/INFO," and "Modeling Our World," He lives in Santa Fe, New Mexico.