The detection of suitable services for solving a defined task, commonly referred to as Web service discovery, is regarded as the most important operation in service-oriented environments, since it is the prerequisite of the core technical benefit of SOA: reuse. With the current Web service technology stack, service discovery is limited to a syntactic keyword based search mechanism aided by a simple metadata service description taxonomy and browsing capabilities. In future service environments with already thousands of available services in local organizational infrastructures, much more...