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<h1>RDF Main Elements</h1>
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<p class="intro">The main elements of RDF are the root element, <RDF>, and the
<Description> element, which identifies a resource.</p>
<hr />
<h2>The <rdf:RDF> Element</h2>
<p><rdf:RDF> is the root element of an RDF document. It defines the XML document
to be an RDF document. It also contains a reference to the RDF namespace:</p>
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<pre><?xml version="1.0"?></pre>
<pre><rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
.
. Description goes here
.
</rdf:RDF>
</pre>
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<h2>The <rdf:Description> Element</h2>
<p>The <rdf:Description> element identifies a resource with the about attribute.</p>
<p>The <rdf:Description> element contains elements that describe the resource:</p>
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<pre><?xml version="1.0"?></pre>
<pre><rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#"> </pre>
<pre><rdf:Description
rdf:about="http://www.recshop.fake/cd/Empire Burlesque">
<cd:artist>Bob Dylan</cd:artist>
<cd:country>USA</cd:country>
<cd:company>Columbia</cd:company>
<cd:price>10.90</cd:price>
<cd:year>1985</cd:year>
</rdf:Description></pre>
<pre></rdf:RDF></pre>
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<p>The elements, artist, country, company, price, and year, are defined in the http://www.recshop.fake/cd#
namespace. This namespace is outside RDF (and not a part of RDF). RDF defines only the
framework. The elements, artist, country, company, price, and year, must be defined by someone else (company,
organization,
person, etc).</p>
<hr />
<h2>Properties as Attributes</h2>
<p>The property elements can also be defined as attributes (instead of elements):</p>
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<pre><?xml version="1.0"?></pre>
<pre><rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#"> </pre>
<pre><rdf:Description
rdf:about="http://www.recshop.fake/cd/Empire Burlesque"
cd:artist="Bob Dylan" cd:country="USA"
cd:company="Columbia" cd:price="10.90"
cd:year="1985" /></pre>
<pre></rdf:RDF></pre>
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<h2>Properties as Resources</h2>
<p>The property elements can also be defined as resources:</p>
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<pre><?xml version="1.0"?></pre>
<pre><rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#"> </pre>
<pre><rdf:Description
rdf:about="http://www.recshop.fake/cd/Empire Burlesque">
<cd:artist rdf:resource="http://www.recshop.fake/cd/dylan" />
.
.
.
.
</rdf:Description></pre>
<pre></rdf:RDF></pre>
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In the example above, the property artist does not have a value, but a reference
to a resource containing information about the artist.
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