15.2.41. XML Schema import element

发布时间 :2025-10-25 12:23:26 UTC      

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Definition and usage

The import element is used to add multiple schema with different target namespaces to a document.

Element information

  • 父元素: Schema

Grammar

<import
id=ID
namespace=anyURI
schemaLocation=anyURI
*any attributes*
>
(annotation?)
</import>

(? The symbol is declared in the import element, which can appear zero or once. )

Attribute

Description

Id

Optional. Specifies the unique ID of the element.

Namespace

Necessary. Specifies the URI of the namespace to import.

SchemaLocation

Optional. Specifies the URI of the imported namespace.

Any attributes

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

Example 1

The following example shows importing a namespace:

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="http://www.w3cschool.cc/schema"/>
..
..
..
</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.