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Extending the Unified Problem-solving Method Development Language

The task concept is a widely used pattern in reasoning systems. Unified Problemsolving Method Development Language (UPML) is a framework allowing building libraries of generic problem solving components. This paper proposes several improvements in this framework based on observations when modeling a concrete application. It starts from describing in UPML an application intended to solve nonlinear equation systems and identifies places where extensions in the language are of real help.