Defining trustworthiness in Semantic Web by ontological assertions

The paper introduces the model of knowledge management system that handles some aspects of trustworthiness. A method of defining trustworthiness in semantic Web and reasoning over knowledge enriched with trust information is presented. The method provides a way of building trustworthiness information into the assertional part of an ontology. Defining trustworthiness is meant as assigning a set of features to unary and binary assertions. The model defines a ldquotrust ontologyrdquo - an ontology that allows for assigning some features to specified assertions. There is also explained how Semantic Web agents could express their requirements for trust while querying a knowledge management system. The paper concludes with some implementation aspects of a prototype system that incorporates the presented model.