第二章主要介绍了现有的两种最重要的网格体系结构，即五层沙漏结构和开放式网格服务体系结构(ogsa)。

It firstly introduces two kinds of existing architecture: the Layered Grid architecture (LGA) and the Open Grid Services architecture (OGSA).

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面对这一挑战，文章提出构建知识元语义网格平台，实现以知识元为知识单位的知识发现服务体系结构。

Affront this challenge, the new problem of knowledge element Semantic Grid of the platform of knowledge service and knowledge discovery is the design.

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