15.2.38. XML Schema extension element

Element information ¶

父元素： SimpleContent, complexContent

Grammar ¶

(annotation?,((group|all|choice|sequence)?,
((attribute|attributeGroup)*,anyAttribute?)))

(? The symbol is declared within the extension element, which can only appear zero or once, and the* symbol declares that the element can occur zero or more times. )

Attribute	Description
Id	Optional. Specifies the unique ID of the element.
Base	Necessary. Specifies the built-in data type, the name of the simpleType or complexType element.
Xml:lang	Optional. Specifies the language used in the content.

Example 2 ¶

The following example extends an existing complexType element by adding three elements:





  
    
    
  


  
    
      
        
        
        
      
    
  


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                            15.2.38. XML Schema extension element 
                        
                    
                
            
        
        
            

    
        
            
                
                    
                        
                        
                            Principles and Applications of WebGIS 
                        
                        
                             37
                        
                    
                    
                        
                            
  
 
                        
                    
                
                
                    
                        
                            
                                
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   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. 
 
 
                        
                    
                
                
                    
                        
                            
                                
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                                    19. Earth Information Science and Digital Earth 
                                    
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15.2.38. XML Schema extension element

Definition and usage ¶

Element information ¶

Grammar ¶

Example 1 ¶

Example 2 ¶

Principles and Applications of WebGIS

Web框架

WEB基础

Principles, Technologies, and Methods of Geographic Information Systems