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。
XML Schema describes the structure of XML documents.
In this tutorial, you will learn how to read and create the XML Schema language in your application, why XML Schema is more powerful than DTD, and how to use XML Schema in your application.
XML Schema instance ¶
XML Schema reference manual ¶
In the rookie tutorial, we learn the complete XML Schema elements.
XML Schema reference manual
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15.2.36. XML Schema documentation element
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15.2.45. XML Schema list element
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15.2.19. XSD string data type
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15.2.28. XML Schema any element
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15.2.29. XML Schema anyAttribute element
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15.2.56. XML Schema attribute element
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15.2.40. XML Schema group element
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15.2.49. XML Schema element
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15.2.23. XML Editor