The SQL plug-in now supports the SQL "PRIMARY KEY" designator by mapping {OID} tagged UML class attributes to PRIMARY KEY designated columns in the DDL. I also added an example ERD-as-UML-diagram and a brief tutorial on how to use the plug-in. Source is at: ftp://ftp.tuxtopia.com/pub/dia/plug-ins/sql-0.02.tar.gz ftp://az.water.usgs.gov/pub/ashalper/src/dia/plug-ins/sql-0.02.tar.gz Andy