semantic web, query, RDF, internet engineering RDF provides a basic way to represent data for the Semantic Web. We have been experimenting with the query paradigm for working with RDF data in semantic web applications. Query of RDF data provides a declarative access mechanism that is suitable for application usage and remote access. We describe work on a conceptual model for querying RDF data that refines ideas first presented in at the W3C workshop on Query Languages and the design of one possible syntax, derived from rdfDB, that is suitable for application programmers. Further, we present experience gained in three independent implementations of the query language. Abstract. RDF provides a basic way to represent data for the Semantic Web.We have been experimenting with the query paradigm for working with RDF data in semantic web applications. Query of RDF data provides a declarative access mechanism that is suitable for application usage and remote access. We describe work on a conceptual model for querying RDF data that refines ideas first presented in at the W3C workshop on Query Languages [14] and the design of one possible syntax, derived from [7], that is suitable for application programmers. Further, we present experience gained in three implementations of the query language.

Abstract. The Semantic Web and RDF offer a powerful platform for a wide range of applications. However, at this time, the semantic business is still in an embryonic stage. This paper analyses real-life applications: (i) A system in operation used to improve the presentation of corporate data, (ii) a prototype of a news clipping service and (iii) a feasibility analysis of a distributed, public administration database. Common to these applications is a "web database" model where resources are "URIed" -made available on the Web -and "RDF-ed" -described by one or multiple authorities. Descriptions are processed by RDFStore and made available to applications. The success factors of these three applications are analysed, and an application model is drawn up with requirements and desirable features for RDF Engines. In conclusion, we look at how and where the Semantic Web business can grow.