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<h1>RDF Container Elements</h1>
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<p class="intro">RDF containers are used to describe group of things. For
example, to list the authors of a book or to list the members in a band.</p>
<p class="intro">The following RDF elements are used to describe such groups: <Bag>,
<Seq>, and <Alt>.</p>
<hr />
<h2>The <rdf:Bag> Element</h2>
<p>The <rdf:Bag> element is used to describe a list of values that is intended to be unordered.</p>
<p>The <rdf:Bag> element may contain duplicate values.</p>
<h3>Example</h3>
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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/Beatles">
<cd:artist>
<rdf:Bag>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>George</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Bag>
</cd:artist>
</rdf:Description></pre>
<pre></rdf:RDF></pre>
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<h2>The <rdf:Seq> Element</h2>
<p>The <rdf:Seq> element is used to describe a list of values that is intended to
be ordered (For example, in alphabetical order).</p>
<p>The <rdf:Seq> element may contain duplicate values.</p>
<h3>Example</h3>
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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/Beatles">
<cd:artist>
<rdf:Seq>
<rdf:li>George</rdf:li>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Seq>
</cd:artist>
</rdf:Description></pre>
<pre></rdf:RDF></pre>
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<h2>The <rdf:Alt> Element</h2>
<p>The <rdf:Alt> element is used to describe a list of alternative values
(the user can select only one of the values).</p>
<h3>Example</h3>
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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/Beatles">
<cd:format>
<rdf:Alt>
<rdf:li>CD</rdf:li>
<rdf:li>Record</rdf:li>
<rdf:li>Tape</rdf:li>
</rdf:Alt>
</cd:format>
</rdf:Description></pre>
<pre></rdf:RDF></pre>
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<h2>RDF Terms</h2>
<p>In the examples above we have talked about "list of values" when describing
the container elements. In RDF these "list of values" are called members.</p>
<p>So, we have the following:</p>
<ul>
<li>A container is a resource that contains things</li>
<li>The contained things are called members (not list of values)</li>
</ul>
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