Abstract. Semantic Web browsers and other tools aimed at displaying RDF data to end users are all concerned with the same problem: presenting content primarily intended for machine consumption in a human-readable way. Their solutions differ but in the end address the same two high-level issues, no matter the underlying representation paradigm: specifying (i) what information contained in RDF models should be presented (content selection) and (ii) how this information should be presented (content formatting and styling). However, each tool currently relies on its own ad hoc mechanisms and vocabulary for specifying RDF presentation knowledge, making it difficult to share and reuse such knowledge across applications. Recognizing the general need for presenting RDF content to users and wanting to promote the exchange of presentation knowledge, we designed Fresnel as a browser-independent vocabulary of core RDF display concepts. In this paper we describe Fresnel’s main concepts and present several RDF browsers and visualization tools that have adopted the vocabulary so far. 1

Abstract. Due to their low entry barrier, easy deployment, and simple yet powerful features, wikis have gained popularity for agile knowledge management in communities of almost all sizes. Semantic wikis strive to give entered information more structure in order to allow automatic processing of the wiki’s contents. This facilitates enhanced navigation and search in the wiki itself as well as simple reuse of information in external applications or for generating different views on the same information. This makes semantic wikis especially interesting for corporate intranet deployment, implementing the Semantic Intranet. In this paper, we will have a look at Kaukolu, an open source semantic wiki prototype, being deployed in a corporate intranet. External applications use information authored in Kaukolu, effectively forming a cluster of applications interacting and sharing data. 1

In this paper we discuss approaches to display user interfaces for RDF data. Scripting languages such as PHP are used for building user interfaces on the current Web, and are a strong candidate for constructing UIs on the Semantic Web as well. We show how to use RDF for expressing and applying presentation knowledge in a way that is flexible enough to deal with arbitrary data from the Web. We present Arago, an early implementation of a presentation engine that utilizes Fresnel, an RDF display ontology.

Abstract. Digital libraries and archives stand to benefit greatly from theSemanticWeb,whichmayprovideabasisfornovelend-userfunctions targeted at research and teaching. The project “Image Preservation, Information Systems, Access and Research ” seeks to develop an adaptable digital library application based on a back-end of semantically modeled data.By“adaptable ” wemeanabletoadapttodiverselibraryandarchive scenarios, especially involving the integration of different types of material (photographic prints, negatives, drawings, periodicals, books, etc.) in a single system. This requires “mixing and matching ” standard and non-standard catalogue record formats and ontologies to model them. A central problem we have encountered is: how to structure application logic in this context in a way that follows best-practice principles. In this paper we discuss the problem and propose, as a tentative solution, a Semantic Component Architecture, which would provide an integrated, encapsulatingwayofselectingvocabulariesandestablishinginferencerules, recurrent path patterns, graph constraints, catalogue record templates and arbitrary logic. We also review the related issue of encapsulation of low-level graph structures. Key words: Semantic Web application architecture, ontology modularization, path definition languages, digital libraries

Abstract. Digital libraries and archives stand to benefit greatly from the Semantic Web (SW), which may provide a basis for novel end-user functions targeted at research and teaching. The project “Image Preservation, Information Systems, Access and Research ” seeks to develop an adaptable digital library application based on a back-end of semantically modeled data. By “adaptable ” we mean able to adapt to diverse library and archive scenarios, especially involving the integration of different types of material (photographic prints, negatives, drawings, periodicals, books, etc.) in a single system. A problem we have encountered is: the design of algorithms for processing information as it moves from the model to the user interface, and, following user input, from the interface back into the model. In this paper we discuss two specific issues that are encompassed by this general problem: full-text search mechanisms and record display configuration.

Abstract. Semantic Web browsers and other tools aimed at displaying RDF data to end users are all concerned with the same problem: presenting content primarily intended for machine consumption in a human-readable way. Their solutions differ but in the end address the same two high-level issues, no matter the underlying representation paradigm: specifying (i) what information contained in RDF models should be presented (content selection) and (ii) how this information should be presented (content formatting and styling). However, each tool currently relies on its own ad hoc mechanisms and vocabulary for specifying RDF presentation knowledge, making it difficult to share and reuse such knowledge across applications. Recognizing the general need for presenting RDF content to users and wanting to promote the exchange of presentation knowledge, we designed Fresnel as a browser-independent vocabulary of core RDF display concepts. In this paper we describe Fresnel’s main concepts and present several RDF browsers and visualization tools that have adopted the vocabulary so far. 1