Interactive Service Composition and Query

Abstract

The various modern services on the Internet offer a wealth of information. Therefore, the provision of specific credible information becomes more important. Nowadays, different lightweight application architectures based on web services establish themselves as de facto standards for data access and data publishing via so-called REST-based interfaces on the Internet. Within these approaches a flexible integration of services data is becoming a reality, and for the Internet of the future, these activities, designed as Linked Open Data, are becoming increasingly important. In this paper we describe the development of a framework named Joint Service Engine (JSE) for the discovery, integration, processing, and fusion of “semantically” annotated web services. The focus is on the discovery of appropriate service information and the fusion of all gathered information in real time. The processing chain includes the harmonization of different data structures obtained from heterogeneous web services that have to be mapped to specific predefined domain ontologies. In a multimodal dialog shell, JSE supports the system to answer spoken queries like “Give me the neighboring countries of Germany, their populations and the geo-coordinates of the respective capitals”. This requires several service calls and the filtering and combination of their results to provide an adequate answer.