Abstract: A method for defining expressions in a meta-object model of an application by locating a string representation of an expression including an identification of a language of the expression; accessing a data type definition corresponding to the language of the expression, the data type definition including a converter for converting the string representation of the expression into an executable runtime representation of the expression; and converting the string representation of the expression into an executable runtime representation of the expression.

Abstract: Disclosed are a system, method and computer program for component-based processing, comprising a component specification element, a control flow specification element, a data flow specification element, a resource specification element, a quality of service specification derivation element having for output an application model in combination with a quality of service specification derived by implication from relations between components, control flows, data flows and resources, and a runtime engine for deploying said quality of service specification as a runtime contract in a runtime processing environment. Examples of such qualities of service are requirements of a process to have provided for it support for transactionality, recoverability, asynchronous messaging and the like.