Managing Web Service standards and technologies: a comprehensive graphical composer

In this paper we present a way of making web services and ontologies work together. We have developed a software that exploits the ontology descriptions of web services in order to help their composition. Our system automatically generates and stores the whole ontology layer in a relational database; within this approach, a sort of caching system is created which, starting from managed web services, creates a knowledge base without continously convert the Web Service description to its ontology equivalent. We choose to make this logic layer invisible and to let the final user interact with a simple and straightforward graphical interface that both manages the ontology and the actual composition. We will point out pros and cons of using some specific implementations of the state of the art languages that can be used to build such a system, also underlining that we adopt Open Source solutions only.