Modeling SOA: Part 4. Service composition.
soa建模，第4部分：服务合成。
Service composition is a provider's concept.
服务组合是一个提供商的概念。
Service Composition is one of the great benefits of using soa.
服务组合是使用SOA最大的收益之一。
One goal of SOA - Integration as a byproduct of Service composition.
SOA的一个目标：集成作为服务组合的副产品。
It allows service providers to add value through service composition.
服务提供者可通过复合服务来增加价值。
Service registration plays an important role in service composition.
服务注册在服务组合中占有举足轻重的地位。
Service composition should be completed semi-automatically or automatically.
服务合成必须实现半自动化或自动化。
A compatibility model with judgement rules for dynamic web service composition.
提出一种基于判定规则的服务相容性模型。
Note that this is different from the service composition that we will discuss later.
注意这不同于我们后面将要讨论的服务复合。
A dynamic service composition model and select algorithm based on grid was presented.
提出了基于网格的动态服务组合模型与算法。
To show advantages of using events for service composition, let's consider a simple example.
为了说明使用事件进行服务组合的优势，让我们看一个简单的示例。
Finally, we recommend usage of orchestration engines for service composition implementation.
最后，我们建议使用编制引擎来实现复合服务。
The way towards industrialized service composition is a way of based on composition template.
走向工业化的服务组合之路，是一种基于“组合套餐”—服务组合模板的途径。
Service Component Architecture (SCA) aims to achieve the simplification of SOA-based service composition.
服务组件架构(SCA)旨在简化基于SOA的服务组合。
This fact matches the SOA notion of service composition, which provides the most of the SOA business value.
该事实符合服务组合的SOA观点，服务组合最大限度地实现了SOA的业务价值。
Service composition plays a significant role in SOA implementations by providing the following benefits.
复合服务在SOA实现中扮演了重要角色，它带来了以下优点。
Architects following the SOA style must also refine the service composition design (if they select this SOA pattern).
遵循soa风格的架构师也必须细化服务组合设计(如果他们选择了这种SOA模式)。
Integration and service composition can be implemented directly by point-to-point connections and composite services.
集成及服务复合体可以直接由点对点的连接以及服务的复合来实现。
Second, the results of requests are cached, thus decreasing the overall cost of service composition and orchestration.
其次，请求结果是被缓存的，因而可以减低合成服务和编制的总体开销。
In this article we will discuss the main approaches to service composition, both from design and implementation point of view.
在本文中，我们将分别从设计和实现两方面讨论复合服务的主要方式。
First of all, service composition achieves easy management in service units. So, operator doesn't have to think complex detail.
首先，利用业务的可组合性，运营商可以方便地基于业务单位进行管理，不必考虑复杂的实现细节。
The Service Composition pattern organizes the processing logic, adhering to the principles of logical layering and flow independence.
服务组合模式将各种处理逻辑组合起来，参照逻辑分层原则和流程独立性。
This approach provides the basic service composition capability: acquire data, manipulate it, and expose it again as a new Web service.
这种方法提供了基本的服务组合能力：获取数据，操作它，并将它作为新的Web服务暴露。
Here, data flows through service composition logic, service implementation logic and potentially application and data integration logic.
在这种情况下，数据流要通过服务组合逻辑、服务实现逻辑以及应用程序和数据集成逻辑。
In this way, service composition is almost a copy-and-paste process and service invocation is simplified through one standardized interface.
这样，服务组合几乎就是一个复制-粘贴过程，而服务调用也通过仅使用一个接口而得到了简化。
SOA approaches enable and encourage design principles and patterns encompassing encapsulation, service composition, loose coupling, and reuse.
SOA方法允许并提倡使用包括封装、服务组合、松耦合和重用在内的设计原则和模式。
This technique for service composition can be used recursively any number of times, across any set of concerns, or at any level of abstraction.
这种服务组合的技术可以重复地使用无限次，不管您的关注点是什么，也不管抽象的层次如何。
Service composition - where policies define of the rules of collaboration for the aggregate or composite services and rules for the composition.
服务组装——在这里，政策定义了聚合协作或符合服务的规则以及组合更改的规则(流程、过程及所有者关系等)。
According to Jason, the essential benefit of process Isomorphism is the ability to use the process to represent service composition and vice-versa.
在Jason看来，流程同构的本质优点是能够使用流程来表示服务组合，以及使用服务组合表示流程。
The next article in this series, "Modeling SOA: Part 4. Service composition," will describe how these services can be composed to create new services.
在本系列的下一篇文章“soa建模第四部分服务组成”中，将会描述这些服务如何能够被组合在一起来创建新的服务。
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