Horn, an ECAD database structure

The subject of this thesis is to study the graphical and data requirements of an ECAD system and propose a database that merges the information into a single cohesive structure. For ECAD applications, traditional database structures pose many limitations and usually ignore graphics aspects altogether. Since graphical information is highly dependent upon the graphics implementation, the international standard, GKS, was used for the foundation of the graphical information. The proposed structure is not intended for direct interface to GKS, but can provide relevant information for GKS through an interface applications program. Electronic design is usually done in a hierarchical manner using components (objects), and relating them to one another through connections. Thus the ECAD database should support this. To reduce redundancies, a network structure was added to minimize duplicated data, thus the name Hierarchical Object Related Network.