15.2.34. XML Schema complexContent element

Element information ¶

父元素： ComplexType

Grammar ¶

<complexContent
id=ID
mixed=true|false *
any attributes*
>
(annotation?,(restriction|extension))
</complexContent>

(? The symbol declaration element can appear zero or once within the complexContent element. )

Attribute	Description
Id	Optional. Specifies the unique ID of the element.
Mixed	Optional. Specifies whether character data is allowed to appear between children of the complexType element. The default is false.
Any attributes	Optional. Specifies any other attributes with the non-schema namespace.

Example 1 ¶

In the following example, there is a complex type “fullpersoninfo” that is derived from another complex type “personinfo” by extending the inherited type with three supplementary elements:

<xs:element name="employee" type="fullpersoninfo"/>
<xs:complexType name="personinfo">
  <xs:sequence>
    <xs:element name="firstname" type="xs:string"/>
    <xs:element name="lastname" type="xs:string"/>
  </xs:sequence>
</xs:complexType>
<xs:complexType name="fullpersoninfo">
  <xs:complexContent>
    <xs:extension base="personinfo">
      <xs:sequence>
        <xs:element name="address" type="xs:string"/>
        <xs:element name="city" type="xs:string"/>
        <xs:element name="country" type="xs:string"/>
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

In the above example, the “employee” element must contain the following elements in order: “firstname”, “lastname”, “address”, “city”, and “country”.

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.