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An element that can contain other elements or that is allowed to contain attributes is a complex type.
There are four kinds of elements of complex type:
"element only" contain just other elements or attributes-but no text,
"empty" elements contain attributes-but never elements or text,
"mixed content" elements contain a combination of elements, attributes, and/or text-especially elements and text,
"text only" elements contain only text-and possibly attributes.
Within <complexType> definitions, you can specify the allowable element content for the declaration:
When we created a local declaration, we did not include a name attribute in our <complexType> definition.
Local <complexType> definitions are not named, which are called anonymous complex types.
Global <complexType> definitions are always named, so that they can be identified later.
<complexType> definitions can also be used to create mixed and empty content models.
Mixed content models allow you to include both text and element content within a single content model.
<element name="description">
<complexType mixed="true">
<choice minOccurs="0" maxOccurs="unbounded">
<element name="em" type="string"/>
<element name="strong" type="string"/>
<element name="br" type="string"/>
</choice>
</complexType>
</element>
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