12.1.5. Main elements of RDF

发布时间 : 2025-10-25 13:35:43 UTC      

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RDF 的主要元素是 以及可表示某个资源的 元素。

< rdf:RDF > element

< rdf:RDF > is the root element of the RDF document. It defines an XML document as an RDF document. It also contains references to the RDF namespace:

  ... *Description goes here...*  

< rdf:Description > element

The < rdf:Description > element identifies a resource by the about attribute.

The < rdf:Description > element can contain those elements that describe the resource:

   Bob Dylan USA Columbia 10.90 1985   

The elements artist, country, company, price, and year are defined in the namespace http://www.recshop.fake /cd#. This namespace is outside of RDF (not part of RDF). RDF only defines this framework. The elements artist, country, company, price, and year must be defined by others (companies, organizations, individuals, etc.).

Attribute (property) to define the attribute (attribute)

Attribute elements (property elements) can also be defined as attributes (instead of elements) as attributes (attributes):

        

Attribute (property) to define the attribute (attribute)

Attribute elements (property elements) can also be defined as attributes (instead of elements) as attributes (attributes):

    ... ...      

In the above example, the attribute artist has no value, but references a resource that contains information about the artist.

《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。