OpenSAGA is a model-centric Web application framework. It focuses on an abstract, non-technical application model that gets translated into an actual application by OpenSAGA. The model is mostly intentional and declarative instead of procedural. It describes what is there and how it's connected to other things instead of describing what to do. OpenSAGA aims to abstract the business concerns of an application away from its technical aspects. Currently, the model is edited as XML files assisted by an XML schema and an Eclipse plugin.