XML Schema 参考手册 完整 XML Schema 参考手册 The notation element describes the format of non-XML data in an XML document. 父元素： Schema (? The symbol declares that the element can appear zero or once in the notation element. ) Attribute Description Id Optional. Specifies the unique ID of the element. Name Necessary. Specify a name for the element. Public Necessary. The URI reference that corresponds to the public identifier. System The URI reference that corresponds to the system identifier. Any attributes Optional. Specifies any other attributes with the non-schema namespace. The following example displays notation in gif and jpeg formats by using a view application view.exe: 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 ¶
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Principles, Technologies, and Methods of Geographic Information Systems
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