XML Schema 参考手册 完整 XML Schema 参考手册 The annotation element is a top-level element that specifies the comments for the schema. 父元素: Any element 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.
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 ¶
<annotation
id=ID
*any attributes*
>
(appinfo|documentation)\*
annotation>
Example 1 ¶
Principles, Technologies, and Methods of Geographic Information Systems
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