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Complex-type elements have attributes, child elements, or some combination of the two. For example, the Name and HomePage elements below are both complex-type elements.

Code Sample:

<?xml version="1.0"?>
	<HomePage URL="http://www.marktwain.com"/>

As the diagram below shows, a complex-type element can be empty, contain simple content such as a string, or can contain complex content such as a sequence of elements.

Whereas it is not necessary to explicitly declare that a simple-type element is a simple type, it is necessary to specify that a complex-type element is a complex type. This is done with the xs:complexType element as shown below.

<xs:element name="ElementName"> <xs:complexType> <!--Content Model Goes Here--> </xs:complexType> </xs:element>