XML Schema 参考手册 完整 XML Schema 参考手册 The redefine element allows you to redefine simple and complex types, groups, and attribute groups obtained from external schema files in the current Schema. 父元素: Schema Attribute Description Id Optional. Specifies the unique ID of the element. SchemaLocation Necessary. A URI reference to the location of the schema document. Any attributes Optional. Specifies any other attributes with the non-schema namespace. The following example shows a schema,Myschama2.xsd in which there are elements specified by Myschama1.xsd. The pname type is redefined. According to this schema, elements constrained by pname must end with a “country” element: 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. Definition and usage ¶
Element information ¶
Grammar ¶
<redefine
id=ID
schemaLocation=anyURI
*any attributes*
>
(annotation|(simpleType|complexType|group|attributeGroup))\*
redefine>
Example 1 ¶
**Myschema1.xsd:**
Principles, Technologies, and Methods of Geographic Information Systems
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