The settings.agconf file is an XML document with four sections: Form, Business Record, Business Application, and Database. It is used to manage the properties available to each of the diagrams used by the Business Application Modeler.
The file is located in the template directory GSTDIR/gst/bin/src/ag/tpl/dbapp3.0.
The XML schema for settings.agconf is GSTDIR/gst/conf/schema/agconf.xsd.