What do levels of abstraction provide?
抽象级别提供了什么呢？
Levels of abstraction in policies and rules.
策略和规则的抽象层次。
Applying Levels of Abstraction to IT solutions.
将抽象层次应用到IT解决方案。
Core Principles When Applying Levels of abstraction.
应用抽象层次时的核心原则。
The three levels of abstraction are defined as follows
三个抽象层次定义如下
Levels of Abstraction: a Powerful Weapon for All engineers.
抽象层次：所有工程师的强大武器。
Focus on thinking simultaneously at different levels of abstraction.
同时，专注于不同层次的抽象概念。
System designers model computer systems using levels of abstraction.
系统设计师使用抽象层次为计算机系统建模。
Conceptually, there are three major levels of abstraction within soa.
从概念上讲，SOA中有三个主要的抽象级别。
Higher levels of abstraction have less detail; lower levels have more.
抽象级别越高，细节信息越少；级别越低，细节信息越多。
Figure 4: The increasing levels of abstraction for software practitioners.
图4：对于软件从业者渐增的抽象级别。
Reverse transformations also exist from lower to higher levels of abstraction.
还存在从较低抽象级别到较高抽象级别的反向转换。
These principles also hold true when applying levels of abstraction to software.
当把抽象层次应用到软件时，这些原则也同样适用。
In MDD, patterns can occur at all levels of abstraction in modeling. For example.
在MDD中，模式可以出现在建模的所有抽象层次上。
This article presents techniques for applying levels of abstraction to IT solutions.
本文展示了将抽象层次应用到IT解决方案的技术。
All engineers follow this core set of principles when applying levels of abstraction.
所有工程师在应用抽象层次时都遵循这套核心原则。
Our simple example defines the following four levels of abstraction for an IT solution.
我们的简单示例定义IT解决方案的如下四个抽象层次。
The same concepts apply at any of these levels of abstraction or across different concerns.
相同的概念应用于这些抽象的层次或者不同的关注点之间。
A key aspect of transformations is that they enable you to cross levels of abstraction.
转换的一个关键方面是，它们能使您进行各种层级的抽象。
Figure 1: Greater productivity demands higher levels of abstraction and automatic translation.
图1：更大的生产力需要更高的抽象层次和自动的翻译。
These decisions are recursively nested and add increasing detail at lower levels of abstraction.
这些决策递归嵌套，并在较低的抽象级别中不断地添加细节。
Most software developers know that they should decompose the solution into levels of abstraction.
大多数软件开发人员懂得应该将解决方案分解到抽象层次。
A model is at a specific level of abstraction, and it can evolve into lower levels of abstraction.
模型位于特定的抽象级别，可以将其转换到更低的级别抽象。
Patterns are relevant to architecture and can occur across all of the various levels of abstraction.
模式与体系结构相关，可能出现在所有抽象级别上。
In fact, there are several ways that achieve the same result through different levels of abstraction.
实际上，有几种方法都可以通过不同层次的抽象来实现相同的结果。
Business process modeling is done for a variety of purposes and at many levels of abstraction and detail.
实现业务流程建模的目的是多种多样的，实现的抽象和细节层面也各有不同。
The MDD approach also allows traceability, which is basically going from lower to higher levels of abstraction.
MDD方法还支持可跟踪性，通常是从低抽象级到高抽象级的跟踪。
Now that we have identified the key levels of abstraction, let's take a closer look at the relationships between them.
现在，我们已经标识了重要的抽象级别，让我们更深入地研究它们之间的关系。
RDA provides extensive data modeling capabilities that allow data models to be defined at different levels of abstraction.
RDA提供大量的数据建模功能，以便在不同级别的抽象上定义数据模型。
The underlying framework should also allow for traceability, which is basically going back to higher levels of abstraction.
基础框架还应该考虑可跟踪性，该功能实际上就是回溯到较高的抽象级别。
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