通常，WSDL提供一个抽象的语言以利用各自的参数和数据类型来定义被发布的操作。
In general, WSDL provides an abstract language for defining the published operations of a service with their respective parameters and data types.
事实上，Oslo的建模语言是专门针对一个抽象的数据模型而构建的。
Actually Oslo's modeling language is built against an abstract data model.
由于SQL与过程化语言不同，它提供了更高的抽象级别，因此它可以让程序员把精力集中到他们需要什么样的数据，而不是如何检索数据。
Because of the higher level of abstraction it provides, SQL, unlike procedural languages, lets programmers focus on what data they need, not how to retrieve it.
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