PORSCE II is comprised by a planning component, a concept relevance module for discovering similarities among OWL ontology concepts, a visual component, and a service replacement component, which cooperate to achieve the goal of automated semantic web service composition. The planning module is responsible for expressing the web service composition problem as a planning problem and exporting it to the standard language for planning domain and problem description, PDDL. In addition, it cooperates with independent external PDDL-compliant planning systems (LPG-td, JPlan), which search for composition plans by matching OWL-S profile input and output parameters, and evaluates the produced plans, in order to use this evaluation when assessing the quality of each complex service. The concept relevance module exploits knowledge obtained from reasoning over ontologies to semantically enhance the input and output requirements of the web services, by including semantically related ontology concepts based on different notions of concept similarity.
