One of the results of the Open Hypermedia work of the last decade was the Fundamental Open Hypermedia Model (FOHM) capable of representing contextual structure from a variety of hypermedia domains. As the Semantic Web becomes more important it is interesting to compare its metadata language, the Resource Description Framework (RDF), with a model such as FOHM. In this paper we examine the relati...

As Resource Description Framework (RDF) reaches maturity, there is an increasing need for tools that support it. A common and natural representation for RDF data is a directed labeled graph. Although there are tools to edit and/or browse RDF graph representations, we found their architecture rigid and not easily amenable to producing effective visual representations, especially for large RDF gr...

The Resource Description Framework (RDF) is a Semantic Web standard that provides a data language, simply called RDF, as well as a lightweight ontology language, called RDF Schema. We investigate embeddings of RDF in logic and show how standard logic programming and description logic technology can be used for reasoning with RDF. We subsequently consider extensions of RDF with datatype support,...

This paper reviews the process that was undertaken in revising the transfer syntax for RDF as defined in the RDF Model and Syntax W3C Recommendation[1] by the RDF Core Working Group[2] and the problems that are now clear especially comparing the revised RDF model and new abstract syntax. The syntax looks out of date in particular with the use of XML QNames giving unconstrained syntax terms in t...

E-Commerce applications require the exchange of data in an interoperable manner. XML enables syntactic interoperability but more sophisticated E-Commerce applications require semantic interoperability as well. RDF is an application of XML intended to exchange semantics between Web applications. RDF schemata can be used to describe the concepts and constraints of a specific application domain at...

Both Topic Maps and RDF are popular semantic web standards designed for machine processing of web documents. Since these representations were originally created for different purposes, they have differences both in their concepts and in their data models. The Topic Map data model can be seen as an ontology for building indices over web documents, whereas RDF is a language to define arbitrary pr...

As RDF reaches maturity, there is an increasing need for tools that support it. A common and natural representation for RDF data is a directed labeled graph. Although there are tools to edit and/or browse RDF graph representations, we found their architecture rigid and not easily amenable to producing effective visual representations, especially for large RDF graphs. We present here GViz, a gen...

With the development of the Semantic Web, an increasingly large number of organizations represent their data in RDF format. A single machine cannot efficiently process complex queries on RDF graphs. It becomes necessary to use a distributed cluster to store and process large-scale RDF datasets that are required to be partitioned. In this paper, we propose a semantic-aware partitioning method fo...

The Resource Description Framework (RDF) is a Semantic Web standard that provides a data language, simply called RDF, as well as a lightweight ontology language, called RDF Schema. We investigate embeddings of RDF in logic and show how standard logic programming and description logic technology can be used for reasoning with RDF. We subsequently consider extensions of RDF with datatype support,...

The semantic web represents meta-data as a triple relation using the RDF data model. We have developed a system to process queries to RDF views of entire relational databases. Optimization of queries to such views is challenging because i) RDF views of entire relational databases become large unions, and ii) queries to the views are more general than relational database queries, making no clear...