One GINA file is used to define one database or a specified portion of a database. The GINA file contains schema definitions, coordinate system definitions, layer and network definitions, foreign key definitions, feature coordinates, and feature attributes. It does not contain definitions for feature codes, symbols, fonts, or symbologies. Each database is made up of a number of related structures.
Thematic layers contain networks that are made up of topologically connected features.
It also contains system attributes such as layer number, network number, feature type, and optional user-defined attributes, in a single record. Complex attribute structures are stored as indirect attribute tables with key fields that match one or more key fields in the primary attribute record. Each feature can also contain a graphic text string. The system attributes of a feature include a feature code and two graphic parameters. The feature code determines which attribute definition applies to the feature.