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。
Resource description Framework (RDF) is a W3C standard for describing web resources, such as the title, author, modification date, content, and copyright information of a web page. Before continuing, you need to have a basic understanding of the following knowledge: HTML XHTML XML XML Namespace If you want to learn about these projects first, please visit our 首页 . RDF refers to the Resource description Framework (Resource Description Framework) RDF is a framework for describing resources on Web RDF provides a model and syntax for data so that independent groups can exchange and use it RDF is designed to be read and understood by computers RDF was not designed to show people RDF is written in XML RDF is an integral part of W3C semantic web activities RDF is a W3C recommendation Describe the properties of shopping items, such as price and availability Describe the schedule of Web events Describe information about the page, such as the content, the author, and the date it was created and modified Describe the content and level of the web picture Describe the content for search engines Describe the electronic library RDF is designed to provide a general way to describe information so that it can be read and understood by computer applications. RDF descriptions are not designed to be displayed on the web. RDF documents are written in XML. The XML language used by RDF is called RDF/XML. By using XML,RDF information, you can easily exchange information between computers using different types of operating systems and application languages. The RDF language is an integral part of W3C’s semantic Web activities. The goal of W3C’s semantic Web Vision (Semantic Web Vision) is: Web information has an exact meaning Web information can be understood and processed by computers. Computers can integrate information from Web RDF became a W3C standard in February 2004. W3C recommendation (standard) is regarded as web standard by industry and web community. The W3C recommendation is a stable specification developed by the W3C working group and reviewed by W3C members. You can find the official W3C recommendation through this link.The basic knowledge you should have ¶
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