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。
The Dublin Core metadata Initiative (DCMI) has created some predefined properties to describe documents. RDF is metadata (data about data). RDF is used to describe information resources. The Dublin core is a set of predefined properties that describe the document. The first Dublin core attributes were defined by the metadata working Group in Dublin, Ohio in 1995 and are currently maintained by the Dublin metadata Initiative. Attribute Define Contributor An entity (such as an author) responsible for contributing to the content of a resource. Coverage The atmosphere or scope of resource content Creator An entity that is primarily responsible for creating resource content. Format Physical or digital representation of resources. Date The date of an event in the resource life cycle. Description Description of the content of the resource. Identifier An explicit reference to a resource in a given context Language The language used in the content of resource intelligence. Publisher An entity responsible for making the content of the resource available Relation A reference to a related resource Rights Information about rights reserved within and above resources Source A reference to a resource that is the source of the current resource. Subject A theme of resource content Title A name for the resource Type The type or type of content of the resource. By browsing the table above, we can find that RDF is very suitable for expressing Dublin core information. The following example demonstrates the use of Dublin core attributes in an RDF document:Dublin core ¶
RDF instance ¶