Figure 2From: OntoDas – a tool for facilitating the construction of complex queries to the Gene OntologyOntoDas Architecture. OntoDas has a three-tier architecture: The display tier consists of Ajax running within a web browser, being used by a researcher. The "business" tier runs on an Apache Tomcat web server, and provides query execution as well as DAS proxying. The final tier consists of external systems: The Ontology Lookup Service as well as various DAS services are accessed remotely via HTTP. The GO MySQL database is intended to be installed on a MySQL server on a local network with the Tomcat server.Back to article page