15.2.52. XML Schema simpleContent element

发布时间 :2025-10-25 12:23:24 UTC      

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Definition and usage

The simpleContent element contains extensions or restrictions to the complexType element, which takes character data or simpleType elements as its content, and does not contain any elements.

Element information

  • 父元素: ComplexType

Grammar

<simpleContent
id=ID
*any attributes*
>
(annotation?,(restriction|extension))
</simpleContent>

(? The symbol declares that the element can appear zero or once in the simpleContent element. )

Attribute

Description

Id

Optional. Specifies the unique ID of the element.

any attributes

Optional. Specifies any other attributes with the non-schema namespace.

Example 1

This is a XML element (< shoesize >) that contains only text:

<shoesize country="france">35</shoesize>

The following example declares a complex type “shoesize” whose content is defined as an integer data type with a country attribute:

<xs:element name="shoesize">
  <xs:complexType>
    <xs:simpleContent>
      <xs:extension base="xs:integer">
        <xs:attribute name="country" type="xs:string" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>

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Principles, Technologies, and Methods of Geographic Information Systems  102

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.