ABSTRACT:Spatial Relation is one of the important components of Geographical Information Science and Spatial Database. There have been lots of researches on Spatial Relation and many different spatial relations have been proposed. The relationships among these spatial relations such as hierarchy and so on are complex and this brings some difficulties to the applications and teaching of these spatial relations. This paper summaries some common spatial relations, extracts the topic types, association types, resource types of these spatial relations using the technology of Topic Maps, and builds many different relationships among these spatial relations. Finally, this paper utilizes Java and Ontopia to build a topic map among these common spatial relations, forms a complex knowledge network of spatial relations, and realizes the effective management and retrieval of spatial relations.
As a typical representative of the Chinese web2.0 site, Douban site fully shows its own unique characteristics of community service: interest aggregation, the circles shape and prominent opinion leader. That is, Douban site's usercentered positioning reflects the kernel of the SNS website. At the same time, through case analysis among Douban site and relevant portal sites' reading channel and the comparison between Douban site and Renren site, the author digs out the hidden value of the Douban site itself and provides the reference information for the development of SNS websites.
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