15.2.26. XML Schema all element

Element information ¶

父元素： Group, complexType, restriction (both simpleContent and complexContent), extension (both simpleContent and complexContent)

Grammar ¶

<all
id=ID
maxOccurs=1
minOccurs=0|1
*any attributes*
>
(annotation?,element*)
</all>

(? The symbol declares that the element can appear zero or once, while the* symbol declares that the element can appear zero or more times in all elements. )

Attribute	Description
Id	Optional. Unique identifier of the element.
MaxOccurs	Optional. The maximum number of times an element can appear. The value must be 1.
MinOccurs	Optional. The minimum number of times an element can appear. The value can be an integer 0 or 1. To specify that the element is optional, set the property to 0. The default value is 1.
Any attributes	Optional. Specifies any other attributes with the non-schema namespace.

Example 1 ¶

<xs:element name="person">
  <xs:complexType>
    <xs:all>
      <xs:element name="firstname" type="xs:string"/>
      <xs:element name="lastname" type="xs:string"/>
    </xs:all>
  </xs:complexType>
</xs:element>

The above example indicates that “firstname” and “lastname” elements can appear in any order, and both elements must and can only appear once!

Example 2 ¶

<xs:element name="person">
  <xs:complexType>
    <xs:all minOccurs="0">
      <xs:element name="firstname" type="xs:string"/>
      <xs:element name="lastname" type="xs:string"/>
    </xs:all>
  </xs:complexType>
</xs:element>

The above example indicates that “firstname” and “lastname” elements can appear in any order, and each element can appear zero or once!

XML Schema 参考手册完整 XML Schema 参考手册

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.