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<h1>XSD Complex Empty Elements</h1>
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<p class="intro">An empty complex element cannot have contents, only attributes.</p>
<hr />
<h2>Complex Empty Elements</h2>
<p>An empty XML
element:</p>
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<td>
<pre><product prodid="1345" /></pre>
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<p>The "product" element above has no content at all. To define a type
with no content, we must define a type that allows only elements in its content,
but we do not actually declare any elements, like this:</p>
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<pre><xs:element name="product">
<xs:complexType>
<xs:complexContent>
<xs:restriction base="xs:integer">
<xs:attribute name="prodid" type="xs:positiveInteger"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
</xs:element></pre>
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<p>In the example above, we define a complex type with a complex content. The complexContent element signals that we intend to restrict or
extend the content model of a complex type, and the restriction of integer
declares one attribute but does not introduce any element content.</p>
<p>However, it is possible to declare the "product" element more compactly, like
this:</p>
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<td>
<pre><xs:element name="product">
<xs:complexType>
<xs:attribute name="prodid" type="xs:positiveInteger"/>
</xs:complexType>
</xs:element></pre>
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<p>Or you can give the complexType element a name, and let the "product" element
have a type attribute that refers to the name of the complexType (if you use
this method, several elements can refer to the same complex type):</p>
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<td>
<pre><xs:element name="product" type="prodtype"/></pre>
<pre><xs:complexType name="prodtype">
<xs:attribute name="prodid" type="xs:positiveInteger"/>
</xs:complexType></pre>
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