Current middleware solutions, such as application servers and Web services, are very complex software products that are hard to tame because of the intricacies of distributed systems. So far, their functionalities have mostly been developed and managed with the help of administration tools and corresponding configuration files, recently in XML. Though this constitutes a very flexible way of developing and administrating a distributed application, the disadvantage is that the conceptual model underlying the different configurations is only implicit. Hence, its bits and pieces are difficult to retrieve, survey, check for validity and maintain. To remedy such problems, SEMANTIC MANAGEMENT OF MIDDLEWARE contributes an ontology-based approach to support the development and administration of middleware-based applications. The ontology is an explicit conceptual model with formal logic-based semantics. Therefore, its descriptions may be queried, may foresight required actions, or may be checked to avoid inconsistent system configurations. SEMANTIC MANAGEMENT OF MIDDLEWARE builds a rigorous approach towards giving the declarative descriptions of components and services a well-defined meaning by specifying ontological foundations and by showing how such foundations may be realized in practical, up-and-running systems. SEMANTIC MANAGEMENT OF MIDDLEWARE is an excellent training companion for active practitioners seeking to incorporate advanced and leading edge ontology-based approach and technologies. It is a necessary preparation manual for researchers in distributed computing who see semantics as an important enabler for the next generation. This book is also suitable for graduate-level students in computer science.