At the heart of autonomic computing (AC) and on demand services (ODS), business rules play a vital role because they can help 'gluing' managed resources, software components, and e-services together in accordance with business goals. Logic programming, the theoretic basis of rule engines, has gradually gained maturity in academia during past decades. From the practical point of view, however, existing rule engines are not useable enough in business applications, which in turn stalls further development of both logic programming and information technologies in industry. We need a straightforward way to utilize rules in a variety of domains. This paper presents a new paradigm in integrating rule engine technologies into on demand services and their management. We propose a java semantic mapping schema and are implementing a dynamic knowledge-base builder based on well-defined ODS ontologies.