The paper gives an overview about the ongoing FP6-IST INFRAWEBS project and describes the main
layers and software components embedded in an application oriented realisation framework. An important part of
INFRAWEBS is a Semantic Web Unit (SWU) – a collaboration platform and interoperable middleware for
ontology-based handling and maintaining of SWS. The framework provides knowledge about a specific domain
and relies on ontologies to structure and exchange this knowledge to semantic service development modules.
INFRAWEBS Designer and Composer are sub-modules of SWU responsible for creating Semantic Web Services
using Case-Based Reasoning approach. The Service Access Middleware (SAM) is responsible for building up the
communication channels between users and various other modules. It serves as a generic middleware for
deployment of Semantic Web Services. This software toolset provides a development framework for creating and
maintaining the full-life-cycle of Semantic Web Services with specific application support
