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<h1>Themes: Code and Tools Support</h1>
<p>The <a href=
"http://www.w3.org/2001/sw/Europe/plan/workplan.html">SWAD-Europe
workplan</a> describes the structure of the overall project. This
page provides the current state of the Semantic Web tools support
in SWAD-Europe, which encompasses work in several workpackages:
<a href=
"http://www.w3.org/2001/sw/Europe/plan/workpackages/live/esw-wp-7.html">
WP7</a>, <a href=
"http://www.w3.org/2001/sw/Europe/plan/workpackages/live/esw-wp-10.html">
WP10</a>, <a href=
"http://www.w3.org/2001/sw/Europe/plan/workpackages/live/esw-wp-12.4.html">
WP12.4</a>.</p>
<p>This area of the SWAD-Europe project encompasses several
different strands, including software development, surveys of
existing work, and input into standards track work in the RDF Core
and Data Access Working Groups at W3C.</p>
<p>The aim was to build on existing work and experience in the
Semantic Web community and within the project to help get various
data access methods for RDF (APIs and query languages) to the stage
where they could be standardized. To do this, the project undertook
surveys of existing APIs and query languages, implementations of
RDF query languages, including testcases; and demonstrators showing
scalability of the technologies. The focus was on near-term
practical goals and grounding in running code. This work has fed
directly into the W3C's Data Access working group.</p>
<h2>Surveys/FAQs</h2>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_api_comparison_report/">
A Comparison of RDF APIs</a> (D7.1)</h4>
<p>This area of work researches the storage API requirements for
RDF applications. Such APIs are required to access Semantic Web
data stored within various kinds of RDF-aware system. They can be
very low-level or more like query languages in their expressivity.
Existing experience shows that that different sorts of RDF
datastore will have different levels of API, and some datastores
may implement several layers. Work here connects closely with the
W3C RDF Core working group decisions and constraints on the RDF
model; some deployed RDF APIs may not yet precisely reflect the
clarifications of RDF produced by the RDF Core Working Group. This
report looks at RDF features as expressed by the existing round of
Working Drafts produced by the RDF Core Working Group and should
provide a framework for the comparison of APIs and their associated
semantics. "Sticking points" and potential problem areas are
highlighted. The intention is to provide a reasonable basis for the
evaluation of existing and future RDF APIs.</p>
<p><i>Last updated: 2003-02-27</i></p>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_ql_comparison_report/">
An RDF Query FAQ</a> (D7.2)</h4>
<p>This report is intended to compare existing RDF query language
functionality, documenting different scenarios and users for RDF
query languages (for example scripters, programmers; data, schema).
There are many existing documents covering this area. Rather than
repeating work that has already been done we have concentrated on
frequently asked questions (FAQs)</p>
<p><i>Last updated: 2003-04-01</i></p>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_report/">
Tools for Semantic Web Scalability and Storage</a> (D10.1)</h4>
<p>This report surveys the state of semantic web storage for RDF /
triple data using existing free software tools. It takes a
practical approach by targeting the work to the needs of
developers, answering frequently asked questions related to this
subject. The report first reviews previous work in surveying
semantic web data, schema and triple stores, then gives an overview
of the major systems with their feature set and maturity and then
uses that information to provide a set of FAQs with answers related
to storing semantic web data.</p>
<p><i>Last updated: 2002-07-31</i></p>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/scalable_rdbms_mapping_report/">
Mapping Semantic Web Data with Relational Databases</a>
(D10.2)</h4>
<p>This report surveys the schemas used in mapping between Semantic
Web data and relational databases, and discusses mapping approaches
to and from relational schemas. It describes current best practice
for using such systems for Semantic Web data including feature
comparisons, recommendations for particular applications and advice
on tradeoffs.</p>
<p><i>Last updated: 2003-01-23</i></p>
<h2>Software</h2>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_impl/">
Implementation report: a scalable Free Software/Open Source RDF
storage system</a> (D10.3)</h4>
<p>A Free Software/Open Source RDF storage system written in C
together with documentation on implementation issues found; the
report is written for a developer audience.</p>
<p><i>Last updated: 2003-03-07; Dave Beckett continues to work on
the <a href="http://librdf.org/">Redland</a> software described in
this report.</i></p>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_std_query_report/">RDF
Query Standardisation</a> (extra deliverable, D3.18)</h4>
<p>A description of work to implement an RDF query language in the
Redland Application Framework and experiences participating in the
standardisation activity informed by implementation work.</p>
<p><i>Last updated: 2004-09-30</i></p>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_api_impl/">Java RDF
API</a> and <a href=
"http://www.w3.org/2001/sw/Europe/reports/rdf_ql_impl/">Java RDF
Query</a> implementations (D7.3, D7.4)</h4>
<p>An implementation of an RDF API and RDF Query implementation,
written in Java. Open Source/free software.</p>
<p><i>Last updated: 2003-11-05. For a feature-rich and
well-supported Java RDF API and query language, we recommend the
use of HP Lab's <a href="http://jena.sourceforge.net/">Jena2</a>
(<a href=
"http://www.hpl.hp.com/semweb/doc/tutorial/">tutorial</a>).</i></p>
<h2>Tests and community development</h2>
<h4><a href="http://www.w3.org/2003/03/rdfqr-tests/">RDF Query
Testcase Repository</a> and <a href=
"http://www.w3.org/2003/03/rdfqr-tests/summary.html">Summary of
work on tests February-May 2003</a></h4>
<p>A brief summary of work carried out in 2003 to collect and run
RDF query test cases with different implementations, including
references to chatlogs, resultsets and manifest formats.</p>
<p><i>Last updated: 2004-03. Work now continues in the W3C's Data
Access Working Group.</i></p>
<h2>Demonstrations</h2>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/large_scale_demo/">Report</a>
and <a href="http://librdf.org/contexts">demonstrator</a> showing
access to a large scale RDF database (D12.4.1)</h4>
<p>This report describes the development of a demonstrator for
showing the results of searching large scale RDF, presenting the
results of the search in contexts of the original sources along
with metadata about the transaction using the Redland RDF
Application Framework and the Redland Contexts, designed for this
purpose.</p>
<p><i>Last updated: 2004-09-30</i></p>
<h2>Workshops</h2>
<h4><a href=
"http://www.w3.org/2001/sw/Europe/reports/dev_workshop_report_4/">Semantic
Web and Scalability</a> (D3.11)</h4>
<p>The fourth SWAD-Europe developer Workshop on Semantic Web
Storage and Retrieval was held 13-14 November 2003 at Vrije
Universiteit, Amsterdam, Netherlands and attended by 26 semantic
web developers from Europe and the USA discussing practical aspects
of developing and deploying semantic web storage and retrieval
systems.</p>
<p><i>Last updated: 2004-01-13</i></p>
<h2>Talks</h2>
<p><a href=
"http://www.ilrt.bris.ac.uk/people/cmdjb/talks/200409-redland/">Redland,
Raptor and Rasqal - Open Source RDF by Dave Beckett</a> XMLOpen,
Cambridge UK, 23 September 2004.</p>
<p><a href=
"http://www.ilrt.bris.ac.uk/people/cmdjb/talks/200404-dawg-ams/">Presentation
to W3C RDF Data Access Working Group by Dave Beckett</a>, Leiden,
Netherlands, 23 April 2004.</p>
<h2>Useful Links</h2>
<ul>
<li><a href="http://www.w3.org/2001/sw/DataAccess/">W3C Data Access
Working Group (DAWG)</a></li>
</ul>
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