In this paper we present an application framework that leverages geospatial content on the World Wide Web by enabling innovative modes of interaction and novel types of user interfaces on advanced mobile phones and PDAs. We discuss the current development steps involved in building mobile geospatial Web applications and derive three technological pre-requisites for our framework: spatial query operations based on visibility and field of view, a 2.5D environment model, and a presentationindependent data exchange format for geospatial query results. We propose the Local Visibility Model as a suitable XML-based candidate and present a prototype implementation.

This paper discusses an emerging cloud of Linked Open Data in the humanities sometimes referred to as the Graph of Ancient World Data (GAWD). It provides historical background to the domain, before gong on to describe the open and decentralised characteristics which have partially characterised its development. This is done principally through the lens of Pelagios, a collaborative initiative led by the authors which connects online historical resources based on common references to places. The benefits and limitations of the approach are evaluated, in particular its low barrier to entry, open architecture and restricted scope. The paper concludes with a number of suggestion for encouraging the adoption of Linked Open Data within other humanities communities and beyond.

Abstract-Annotations allow users to associate additional information with existing resources. Using proprietary and closed systems on the Web, users are already able to annotate multimedia resources such as images, audio and video. So far, however, this information is almost always kept locked up and inaccessible to the Web of Data. We believe that an important step to take is the integration of multimedia annotations and the Linked Data principles. This should allow clients to easily publish and consume, thus exchange annotations about resources via common Web standards. We first present the current status of the Open Annotation Collaboration, an international initiative that is currently working on annotation interoperability specifications based on best practices from the Linked Data effort. Then we present two use cases and early prototypes that make use of the proposed annotation model and present lessons learned and discuss yet open technical issues.

Spatial information appliances (SIA), which enable mobile users to interact with the physical environment, have recently received an increasing amount of interest from the research community. This paper presents a comparative outdoor user study on conceptual designs for 4 interaction areas considered important for SIAs: selection, search, information sniffing, and remote viewing. Implications for future research are discussed.

Annotations allow end users to augment digital items with information, which can then be exploited for search and retrieval. We are currently extending Europeana, a platform which links to millions of digital items in European institutions, with an annotation mechanism that exposes annotations as linked data and enriches newly created annotations with links to contextually relevant resources on the Web. In two demos we showcase how we integrated that kind of content augmentation into two clients that allow users to annotate videos and historic maps.