1. A method for extensibility of binding definitions for a user interface application comprising: obtaining a framework having definitions of a first set of rules for a first grammar level used for interpretation of binding specifications to a user interface application, wherein the user interface application is incompatible with the first grammar level; performing a first transformation of the framework to generate the first set of rules for interpretation of the binding specifications in the first grammar level; performing a second transformation of the framework to generate a first presentation style for the first grammar level; obtaining the binding specifications in the first grammar level, the binding specification conforming to the first set of rules; and applying the first set of rules and the first presentation style to the binding specification to generate output binding specifications in a second grammar level compatible with the user interface application.