Starting top down - Business layer.

自顶向下——业务层。

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Table 2: Business Layer (Partial Sample).

表2：业务层(部分示例)。

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The business layer executes the business rules.

业务层执行业务逻辑。

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Digg is getting into the breaking news business with a new layer of editorial control.

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Beginning with the well-known Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS) structure, Gartner added in a Business and Information Systems layer that includes brokerages, management and security.

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That allows an investment bank, for instance, to run a business intelligence (BI) layer on top of its spreadsheets.

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