1. A method for extensibility of binding definitions for an application comprising: executing a program by a computer system that transforms the computer system into a machine that performs: obtaining a framework having definitions of a first set of rules for a first grammar level used for interpretation of binding specifications to bind a user interface object to an underlying object, wherein the 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 application.