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<h1>XSD - The <schema> Element</h1>
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<p class="intro">The <schema> element is the root element of every XML Schema.</p>
<hr />
<h2>The <schema> Element</h2>
<p>The <schema> element is the root element of every XML Schema:</p>
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<pre><?xml version="1.0"?></pre>
<pre><xs:schema></pre>
<pre>...
...</pre>
<pre></xs:schema></pre>
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<p>The <schema> element may contain some attributes. A schema declaration often looks
something like this:</p>
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<pre><?xml version="1.0"?></pre>
<pre><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified"></pre>
<pre>...
...</pre>
<pre></xs:schema></pre>
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<p>The following fragment:</p>
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<pre>xmlns:xs="http://www.w3.org/2001/XMLSchema"</pre>
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<p>indicates that the elements and data types used in the schema come from the "http://www.w3.org/2001/XMLSchema"
namespace. It also specifies that the elements and data types that come from the
"http://www.w3.org/2001/XMLSchema" namespace should be prefixed with
<b>xs:</b></p>
<p>This fragment:</p>
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<pre>targetNamespace="http://www.w3schools.com"</pre>
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<p>indicates that the elements defined by this schema (note, to, from, heading,
body.) come from the "http://www.w3schools.com" namespace.</p>
<p>This fragment:</p>
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<pre>xmlns="http://www.w3schools.com"</pre>
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<p>indicates that the default namespace is "http://www.w3schools.com".</p>
<p>This fragment:</p>
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<pre>elementFormDefault="qualified"</pre>
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<p>indicates that any elements used by the XML instance document which were
declared in this schema must be namespace qualified.</p>
<hr />
<h2>Referencing a Schema in an XML Document</h2>
<p>This XML document has a reference to an XML Schema:</p>
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<pre><?xml version="1.0"?></pre>
<pre><note xmlns="http://www.w3schools.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3schools.com note.xsd"></pre>
<pre><to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
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