Abstract
Many organizations often need to share semantic knowledge base content with selected members of other organizations. However, sharing semantic knowledge across different organizations is a critical problem. This is because the differences in the vocabulary utilized by the organizations have to be resolved before knowledge can be shared. Also, if semantic repositories are syntactically and schematically heterogeneous, information interoperation becomes a vital challenge. When a system needs to allow unknown entities to access its resources, mechanisms should be in place in order to provide a secure and trusted information-sharing environment and enable users to interact and share information easily and perfectly. To address these challenges, the Mediator Authorization-Security model is proposed to provide secure interoperation among heterogeneous semantic repositories. This paper addresses the issue of interoperability and how to incorporate trust into semantic interoperability. The evaluation showed that, despite the complexity of the mediator system, it still provides acceptable performance. (C) 2015 Elsevier B.V. All rights reserved.