Ontologies
Ontologies are specifications of domain concepts and their relationships. They are essential building blocks of well-designed knowledge-based systems. Although being high-level representations of abstract knowledge models, ontologies yet have to be mapped to some kind of object model in order to be used in an executable system. http://smi-web.stanford.edu/people/holger/publications/OOPSLA99-Metadata.html
Disease Ontologies
To develop
Organ Ontologies
Tissue Ontologies
Lesion Ontologies
Supported by sourceforge.net (Phenotype and Disease Ontologies)