We present in this paper a framework that provides support for interoperability between XML Schema based and OWL based applications. In particular, we describe how the information exchange between such applications is achieved, through the transformations of XML documents to OWL/RDF descriptions and of OWL/RDF descriptions to (parts of) valid XML documents. This functionality is built on top of...

Although RDF graph data often come with an associated schema, recent studies have proven that real RDF data rarely conform to their perceived schemas. Since a number of data management decisions, including storage layouts, indexing, and efficient query processing, use schemas to guide the decision making, it is imperative to have an accurate description of the structuredness of the data at hand...

RAP RDF API for PHP is a Semantic Web toolkit for PHP developers. It offers features for parsing, manipulating, storing, querying, serving, and serializing RDF graphs. RAP was started as an open source project by the Freie Universität Berlin in 2002 and has been extended with code contributions from the Semantic Web community. Its latest release (V0.9.1) includes among others: a statement-centr...

The present RDF is opaque in reusing the descriptions in ready-made metadata repositories. To enhance reusability of descriptions in RDF/XML, we need a unit for packaging a set of descriptions on a semantic schema level. And, we may need a new rule to handle a composite unit of not linearfold but link-based or graph data structure, and serialize it to reuse.

This paper demonstrates the potential of the Semantic Web as a platform for representing, navigating and processing arguments on a global scale. We use the RDF Schema (RDFS) ontology language to specify the ontology of the recently proposed Argument Interchange Format (AIF) and an extension thereof to Toulmin’s argument scheme. We build a prototype Web-based system for demonstrating basic query...

This paper demonstrates the potential of the Semantic Web as a platformfor representing, navigating and processing arguments on a global scale. We usethe RDF Schema (RDFS) ontology language to specify the ontology of the recentlyproposed Argument Interchange Format (AIF) and an extension thereof to Toul-min’s argument scheme. We build a prototype Web-based system for demonstrat-...

This paper demonstrates the potential of the Semantic Web as a platform for representing, navigating and processing arguments on a global scale. We use the RDF Schema (RDFS) ontology language to specify the ontology of the recently proposed Argument Interchange Format (AIF) and an extension thereof to Toulmin’s argument scheme. We build a prototype Web-based system for demonstrating basic query...

Mapping relational data to RDF is an important task for the development of the Semantic Web. To this end, the W3C has recently released a Recommendation for the so-called direct mapping of relational data to RDF. In this work, we propose an enrichment of the direct mapping to make it more faithful by transferring also semantic information present in the relational schema from the relational wor...

This paper presents the open source reference implementation of RuleML based on modular XML Schema definitions and bidirectional OO jDREW interpreters written in Java. For the family of RuleML sublanguages, schema modularization and RDF rules are discussed. The central bidirectional interpreters are introduced via jDREW principles, and explained w.r.t. OO jDREW slots, types, OIDs, and extensions.

XQuery is a query language designed to allow queries across the many kinds of information that are represented in XML. Although topic maps and RDF can also be represented in XML, many have held that their many possible syntactic forms make them extremely difficult to query using an XML query language, and that they can only be queried using special-purpose query languages with built-in knowledg...