15.2.6. XSD simple element

XML Schema defines the elements of the XML file.

Simple elements are those that contain only text. It does not contain any other elements or attributes.

What are simple elements? ¶

Simple elements are those that contain only text. It does not contain any other elements or attributes.

However, the limitation of “text only” can easily be misunderstood. There are many types of text. It can be one of the types included in the XML Schema definition (Boolean, string, data, etc.), or it can be a custom type that you define yourself.

You can also limit its content by adding qualifications (that is, facets) to the data type, or you can require the data to match a particular schema.

Define simple elements ¶

Define the syntax for simple elements:

<xs:element name="xxx" type="yyy"/> 

Here xxx refers to the name of the element, and yyy refers to the data type of the element. XML Schema has many built-in data types.

The most common types are: ¶

Xs:string
Xs:decimal
Xs:integer
Xs:boolean
Xs:date
Xs:time

Example ¶

Here are some XML elements:

<lastname>Refsneslastname> <age>36age> <dateborn>1970-03-27dateborn>     This is the corresponding simple element definition: 
   <xs:element name="lastname" type="xs:string"/> <xs:element name="age" type="xs:integer"/> <xs:element name="dateborn" type="xs:date"/> 
 
 
    Default values and fixed values for simple elements  ¶  
  Simple elements can have specified default values or fixed values. 
  When no other value is specified, the default value is automatically assigned to the element. 
  In the following example, the default value is “red”: 
   <xs:element name="color" type="xs:string" default="red"/> 
 
 
  A fixed value is also automatically assigned to the element, and you cannot specify another value. 
  In the following example, the fixed value is “red”: 
   <xs:element name="color" type="xs:string" fixed="red"/> 
 
 
   
                
                
                    
                        
                            
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                            15.2.6. XSD simple element 
                        
                    
                
            
        
        
            

    
        
        
            
                
                    
                        
                            
                                Web框架 
                            
                            
                        
                             946
                        
                    
                    
                    
                        
                            
  
 
                        
                    
                
                
                    
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
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                                                1. SVG tutorial 
                                            
                                            
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                                                2. Vue3 
                                            
                                            
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                                                2. Servlet 
                                            
                                            
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                                                3. React 
                                            
                                            
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                                                3. SOAP tutorial 
                                            
                                            
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                                                3. Android 
                                            
                                            
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                                                3. Mongodb 
                                            
                                            
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                                                3. Kotlin 
                                            
                                            
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                                                4. Lua 
                                            
                                            
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                                                4. MySQL tutorial 
                                            
                                            
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                                                4. Appml 
                                            
                                            
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                                                5. Perl 
                                            
                                            
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                                                5. Postgresql 
                                            
                                            
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                                                web 
                                            
                                            
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                                                5. Web Services tutorial 
                                            
                                            
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                                                6. Ruby 
                                            
                                            
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                                                6. Design-pattern 
                                            
                                            
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                                                7. Django 
                                            
                                            
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                                                7. Rust 
                                            
                                            
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                                                6. WSDL tutorial 
                                            
                                            
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                                                8. Foundation 
                                            
                                            
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                                                9. Ios 
                                            
                                            
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                                                8. Css3 
                                            
                                            
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                                                9. Swift 
                                            
                                            
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                                                11. HTML tutorial-(HTML5 Standard) 
                                            
                                            
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                                                12. Http 
                                            
                                            
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                                                13. Regex 
                                            
                                            
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                                                14. Regexp 
                                            
                                            
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                                《地理信息系统原理、技术与方法》 
                            
                            
                        
                             97
                        
                    
                    
                    
                        
                            
   最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。 
 
 
                        
                    
                
                
                    
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                1. Introduction to geographic information system 
                                            
                                            
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                                                2. From the Real World to the Bit World 
                                            
                                            
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                                                3. Spatial Data Model 
                                            
                                            
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                                                4. 空间参照系统和 地图投影 
                                            
                                            
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                                                5. Data in GIS 
                                            
                                            
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                                                6. Spatial data acquisition 
                                            
                                            
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                                                7. Spatial Data Management 
                                            
                                            
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                                                8. Spatial analysis 
                                            
                                            
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                                                9. 数字地形模型（ DTM ）与地形分析 
                                            
                                            
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                                                10. 空间建模与 空间决策支持 
                                            
                                            
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                                                11. Spatial data representation and map making 
                                            
                                            
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                                                12. 3S Integration Technology 
                                            
                                            
                                                5
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                13. 网络地理信息系统 
                                            
                                            
                                                3
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                14. Examples of Geographic Information System Application 
                                            
                                            
                                                8
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                15. Organization and Management of Geographic Information System Application Projects 
                                            
                                            
                                                9
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                16. Geographic Information system Software Engineering Technology 
                                            
                                            
                                                6
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                17. Geographic Information System Standards 
                                            
                                            
                                                3
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                18. Geographic Information System and Society 
                                            
                                            
                                                3
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                19. Earth Information Science and Digital Earth 
                                            
                                            
                                                3
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                    
                
            
        
    
    
        
        
            
                
                    
                        
                            
                                WEB基础 
                            
                            
                        
                             289
                        
                    
                    
                    
                        
                            
  
 
                        
                    
                
                
                    
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                2. ADO tutorial 
                                            
                                            
                                                23
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                4. W3C tutorial 
                                            
                                            
                                                16
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                5. Data-structures 
                                            
                                            
                                                31
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                8. Scala 
                                            
                                            
                                                41
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                7. Bootstrap5 
                                            
                                            
                                                37
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                10. Markdown 
                                            
                                            
                                                10
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                9. Echarts 
                                            
                                            
                                                12
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                11. Maven 
                                            
                                            
                                                20
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                10. Font-awesome 
                                            
                                            
                                                17
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                12. RDF tutorial 
                                            
                                            
                                                11
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                13. Sass 
                                            
                                            
                                                15
                                            
                                        
                                        
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                        
                            
                                
                                    
                                        
                                        
                                            
                                                
                                                    
                                                15. XML Schema tutorial 
                                            
                                            
                                                56
                                            
                                        
                                        
                                            
                                                
                                                    

                                                        
                                                            
                                                            15.2.36. XML Schema documentation element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.30. XML Schema appinfo element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.45. XML Schema list element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.19. XSD string data type 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.28. XML Schema any element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.29. XML Schema anyAttribute element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.56. XML Schema attribute element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.40. XML Schema group element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.49. XML Schema element 
                                                        
                                                    
                                                
                                            
                                                
                                                    
                                                        
                                                            
                                                            15.2.23. XML Editor 
                                                        
                                                    
                                                
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                        
                                    
                                
                            
                        
                    
                
            
        
    
    
    
    
    
    
    

            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
        
    

                        
                        
                    
                
            
            
                
                    
                        
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