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XML representaion of Wikipedia articlesThe key structural elements are:
Article example in XML
<page xmlns="http://www.mediawiki.org/xml/export-0.3/">
<title>Igor Kurchatov</title>
<id>222567</id>
<revision>
<id>130994728</id>
<timestamp>2007-05-15T09:34:39Z</timestamp>
<contributor>
<ip>212.192.96.9</ip>
</contributor>
<comment>/* References */</comment>
<text xml:space="preserve">
<section depth="1" title="Life and career">
<p>
<a href="image:kurchatov.jpg">thumb|right|Igor Kurchatov</a> <b>Igor Vasilyevich Kurchatov</b>
(<a href="January 12">January 12</a>, <a href="1903">1903</a> – <a href="February 7">February 7</a>,
<a href="1960">1960</a>) was a <a href="Soviet Union">Soviet</a>/<a href="Russia">Russian</a> physicist.
He was the leader of the <a href="Soviet atomic bomb project">Soviet atomic bomb project</a>.
Kurchatov was born in <i>Simsky zavod</i>, <a href="Ufa">Ufa</a> <a href="Guberniya">Guberniya</a>
(now city of <i>Sim</i>, <a href="Chelyabinsk Oblast">Chelyabinsk Oblast</a>). After completing
<a href="Simferopol gymnasium 1"> Simferopol gymnasium 1</a> he studied <a href="physics">physics</a>
at Crimea State University and ship building at the <a href="Saint Petersburg Polytechnical University">
Polytechnical Institute</a> in <a href="Petrograd">Petrograd</a>. In <a href="1925">1925</a> he moved to the
<a href="Ioffe Physico-Technical Institute">Physico-Technical Institute</a>, where he worked (under <a href="Abram
Fedorovich Ioffe">Abram Fedorovich Ioffe</a>) on various problems connected with <a href="radioactivity">
radioactivity</a>.In <a href="1932">1932</a> he received funding for his own nuclear science research team,
which built the Soviet Union's first <a href="cyclotron">cyclotron</a> (<a href="September 21">September 21</a>,
<a href="1939">1939</a>).
</p>
<p>
Igor Kurchatov and his apprentice <a href="Georgy Flyorov">Georgy Flyorov</a> discovered the basic ideas of the
uranium chain reaction and the nuclear reactor concept in the 1930's. In 1942 Kurchatov declared: "At breaking up
of kernels in a kilogram of uranium, the energy released must be equal to the explosion of 20,000 tons of trotyl."
This announcement was practically verified during the atomic bombing of Hiroshima.</p>
<p>
</section>
<section depth="1" title="External links">
<links>
<link href="http://www.kiae.ru/">Kurchatov institute</link>
<link href="http://www.cultinfo.ru/fulltext/1/001/008/067/772.htm">
Biography of Igor Kurchatov (in Russian)
</link>
</links>
</section>
</text>
<catlinks>
<catlink href="Category:Russian physicists"/>
<catlink href="Category:Soviet physicists"/>
<catlink href="Category:Nuclear physicists"/>
</catlinks>
</revision>
</page>
Sedna IndexesFor efficient query execution there is a number of predefined indexes created in Sedna. Each index stands for some common use case in content processing. Retrieve article by its name Definition
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
CREATE INDEX 'article-by-title' ON doc("wiki")/mediawiki/page BY title AS xs:string Query example
(: Return article which title is 'Internet' :)
index-scan('article-by-title','Internet','EQ') Retrieve articles which refers to the article with the specified title (what links here) Definition
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
CREATE INDEX 'article-by-link' ON doc("wiki")/mediawiki/page BY .//link/@label AS xs:string Query example
(: Return the titles of articles which has references to the 'Anarchism' article :)
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
index-scan('article-by-link','Anarchism','EQ')/title
Retrive articles which belong to the given category Definition
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
CREATE INDEX 'article-by-cat' ON doc("wiki")/mediawiki/page BY ./revision/catlinks/catlink/@href AS xs:string Query example
(: Return titles of the articles in 'Russian mathematicians' category :)
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
declare ordering unordered; index-scan('article-by-cat','Category:Russian mathematicians','EQ')/title Full-text search index Definition
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
CREATE FULL-TEXT INDEX 'fti' ON doc("wiki")/mediawiki/page TYPE "xml" Query example
(: Retrive all links from the articles which has 'sedna' in its titles :)
declare default element namespace "http://www.mediawiki.org/xml/export-0.3/";
declare ordering unordered; ftindex-scan('fti','(title contains sedna)')/title//a/@href Predefined queriesFor your convenience we have also prepared a number of predefined queries. You can customize them in any way (click on [edit] to the right of the predefined queries) or write your own query from scratch. |