Data is retrieved from the location Data Provider — a Data Abstract Layer (DAL) component — which caches all locations in memory.

从位置数据提供者检索数据，这是一个数据抽象层(DAL)组件，在内存中缓存所有位置。

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The base abstract type defines several typical elements such as a name and description, as well as elements that support the location of a constraint if it is not contained within the BICS document.

基本抽象类型定义了几种典型的元素，如名称和描述，以及支持定位约束(如果没有包含在BICS文档中)的元素。

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The Data Abstract Layer consists of a single class to provide location-related data to the business layer (see Figure 3).

数据抽象层包含一个类，用于向业务层提供关于位置的信息（请参见图 3）。

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