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<title>Semantic Web Advanced Development for Europe
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<h1 class="title">Large Scale Discovery Demonstrator</h1>
<p>This demonstrator is designed to show a feature developed during
SWADE which was found to be of key importance when dealing with
discovery and presentation of large scale RDF data - tracking where
the data was from, or provenance and enabling displaying that.</p>
<p>The key outputs of this work are:</p>
<ul>
<li>Redland Contexts design</li>
<li><a href="http://librdf.org/contexts">Demonstration</a> showing
this over a large set of RDF files from the web</li>
<li>Several releases of <a href="http://librdf.org/">Redland</a>
software providing the contexts feature</li>
<li>Reports detailing the <a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_report/">
state of existing RDF storage systems</a> <a href=
"http://www.w3.org/2001/sw/Europe/reports/dev_workshop_report_4/">current
issues</a> (workshop), <a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_impl/">
Redland storage improvements</a> and <a href=
"http://www.w3.org/2001/sw/Europe/reports/large_scale_demo/">the
design of the demonstrator</a>.</li>
<li>Identification of a demand for tools with support for
provenance.</li>
<li>Feeding into work in the <a href=
"http://www.w3.org/2001/sw/DataAccess/">W3C RDF Data Access Working
Group (DAWG)</a> to provide this feature in query languages for
RDF.</li>
</ul>
<p>All data, software and documents were developed using open
technical standards and open source.</p>
<p>Key goals of the demonstrator include:</p>
<ul>
<li>Identifying the key problems and issues with large scale RDF
data.</li>
<li>Enhancing tools to address these problems</li>
<li>Showing the use of the tools with this feature, solving the
problems</li>
</ul>
<p>The provenance tracking issue, or contexts, was found to be
important after the related <a href=
"http://www.w3.org/2001/sw/Europe/reports/dev_workshop_report_4/">Developer
Workshop Report 4 - Workshop on Semantic Web Storage and
Retrieval</a> held in November 2003, Amsterdam by which several of
the participants were already considering the issues with large
data, and large aggregated data, leading to needing to provide ways
to manage them.</p>
<p>A model was developed for Redland to provide a more general
approach as it was not clear what the correct approach was that
satisfied similar but not identical use cases for tracking.</p>
<h2>Semantic web features demonstrated</h2>
<p>The demonstrator illustrates the use of Redland Contexts to
track data from several thousand different RDF data sources so that
when information in the aggregated graph appears, the transaction
that provided it can always be found - the provenance.</p>
<p>This demonstrator primarily shows the semantic web components:
distributed data + provenance + webness.</p>
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