15.2.27. XML Schema annotation element

发布时间 : 2025-10-25 12:23:27 UTC      

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XML Schema 参考手册 完整 XML Schema 参考手册

Definition and usage

The annotation element is a top-level element that specifies the comments for the schema.

Element information

  • 父元素: Any element

Grammar

<annotation
id=ID
*any attributes*
>
(appinfo|documentation)\*
</annotation>

The* symbol declares that the element can appear zero or more times in the annotation element. )

Attribute

Description

Id

Optional. Unique identifier of the element.

Any attributes

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

Example 1

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:annotation>
  <xs:appinfo>RUNOOB Note</xs:appinfo>
  <xs:documentation xml:lang="en">
  This Schema defines a RUNOOB note!
  </xs:documentation>
</xs:annotation>
.
.
.
</xs:schema>

XML Schema 参考手册 完整 XML Schema 参考手册

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.