Abstract
Workflow is a formal description of a process. Nested workflows were proposed to model processes with a hierarchical structure and they support extra logical and temporal constraints to express relations beyond the hierarchical structure.
This workflow model supports scheduling applications with a known number of activities in the process, but it cannot be used to model planning problems, where the number of activities is unknown beforehand. In this paper we propose to model nested workflows using a modified version of attribute grammars.
In particular we show that nested workflows with extra constraints can be fully translated to attribute grammars. The major advantage of this novel modeling framework is a support for recursive tasks that can model planning problems in the style of hierarchical task networks.