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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It provides a layer of abstraction to decouple client code from access to a service, as well as its location and underlying implementation.

它提供了一层抽象，解耦了客户端代码与要访问的服务及其位置与底层实现。

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The insulation layer is extremely important to SOA because it allows transparency of database vendor products, OS platforms, information location, data format, and a physical data model.

这种隔离层对于SOA来说非常重要，这是因为它使得数据库厂商的产品、OS平台、信息位置、数据格式以及物理数据模型透明化。

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In a talk that was at times nostalgic, Crowley showed how Foursquare had evolved over the last 4 years from an app that looked to gamify check-in into a location layer that could allow the company to build predictive searches.

FORBES: Foursquare Shifts To Search

It's surprisingly intuitive, and you start to wonder if the Android version could borrow a few touches, such as swiping upwards to expand directions and location details (including reviews) or tucking the layer toggles into a menu pulled out from the right.

ENGADGET: Google Maps for iOS hands-on Mobile

Putting the bulk of computing and storage in the data center has other perks for IT management: It creates a centralized location for software upgrades across an entire organization and puts a layer of network security between users and sensitive data--a lost thin client laptop, for instance, doesn't contain private information, and so doesn't pose a threat of causing a data breach.

FORBES: Magazine Article