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ESSENCE is an immersive internet experiment, and a face-face conference. It invites human-centred technologists, climate scientists, policymakers, and any other stakeholder with a view on some part of the climate change debate, to experience and reflect on a new generation of software tools. Build, structure, summarise and navigate the science and policy arguments underpinning climate challenge. Think of it as a visual Wikipedia, a collective intelligence, to organise the key issues, options and arguments.

ESSENCE is the world's first global climate collective intelligence event - designed to bring together scientists, industrialists, campaigners and policy makers, and the emerging set of web-based sensemaking tools, to pool and deepen our understanding of the issues and options facing the UN Climate Change Conference in Copenhagen in December 2009.

ESSENCE: E-Science/Sensemaking/Climate Change is an immersive internet experiment, culminating in a face-face conference. We want to build a collective intelligence resource on the climate change debate. This is analogous to Wikipedia, but decidely not enforcing a "neutral point of view". We are going to put through their paces tools tuned for mapping the key issues, options, arguments and evidence on the different dillemmas - and reflect on how effective the current tools are.

The essence of information technology for library decision-makers

This ontology supports the development of Protégé ontologies using the OntoClean methodology (PDF). This methodology for ontological analysis was developed by N. Guarino and C. Welty. The OntoClean methodology applies the notions used for ontological analysis in philosophy to analyzing conceptual modeling in information systems. If you include this Protégé ontology in your ontology, you can annotate your classes with meta-properties of identity, unity, essence, and dependence. The OntoClean ontology in Protégé also contains constraints in the Protégé Axiom Language (PAL) enabling you to verify whether the ontology is "clean"---does not violate any of the constraints based on these properties.

Reduced to its essence, China and other developing nations want infusions of both capital and technology from the developed world to help them cut emissions.

OntoClean is a methodology for validating the ontological adequacy of taxonomic relationships. It is based on highly general ontological notions drawn from philosophy, like essence, identity, and unity, which are used to characterize relevant aspects of the intended meaning of the properties, classes, and relations that make up an ontology. These aspects are represented by formal metaproperties, which impose several constraints on the taxonomic structure of an ontology.

With formal negotiations on the new international climate change treaty due to open in three weeks time, Independent readers are starting to work with the Debategraph community to develop a comprehensive map of the issues around climate change that are confronting the negotiators.