Preface
Business Process Execution Language for Web Services (BPEL, WS-BPEL, or BPEL4WS) is the new standard for defining business processes with composition of services. It is the cornerstone of Service Oriented Architecture (SOA). With its ability to define executable and abstract business processes it opens new doors in business process management and represents the top-down approach to the realization of SOA.
BPEL is supported by the majority of software vendors including Oracle, Microsoft, IBM, BEA, SAP, Hewlett-Packard, Siebel, and others. Most of them already have products that support BPEL; others will follow soon.
This book explains the BPEL standard, provides a step-by-step guide to designing and developing business processes in BPEL, defines the role of BPEL in SOA, and discusses how BPEL relates to the web services stack and to other standards. It also covers two important BPEL servers—the Oracle BPEL Process Manager and Microsoft BizTalk Server. The book presents the service-oriented approach to business process definition using web services, which enables us to develop loosely coupled solutions

What This Book Covers
Chapter 1 provides a detailed introduction to BPEL and Service Oriented Architecture (SOA). It discusses business processes and their automation, explains the role of BPEL, web services, and Enterprise Service Buses (ESB) in SOA, provides insight into business process composition with BPEL, explains the most important features, compares BPEL to other specifications, provides an overview of BPEL servers, and discusses the future of BPEL.
Chapter 2 provides a detailed introduction to the Web Services Technology Stack. It discusses the important standards and specifications for using BPEL and implementing SOA with web services, such as WS-Security, WS-Addressing, WS-Coordination, WS-AtomicTransaction, WS-BusinessActivity, WS-Reliable Messaging, etc.
Chapter 3 discusses the composition of web services with BPEL. The chapter introduces the core concepts of BPEL and explains how to define synchronous and asynchronous business processes with BPEL. The reader gets familiar with BPEL process structure, partner



1.前言
用于 Web 服務(wù)的業(yè)務(wù)流程執(zhí)行語(yǔ)言 (Business Process Execution Language for Web Services) 提供了正式指定業(yè)務(wù)流程和交互協(xié)議的方法（BPEL，WS - BPEL的，或BPEL4WS的），是面向服務(wù)的業(yè)務(wù)流程的新標(biāo)準(zhǔn)。它是面向服務(wù)架構(gòu)（SOA）的基石。憑借其能夠定義可執(zhí)行和抽象的業(yè)務(wù)流程，打開(kāi)了業(yè)務(wù)流程管理新的大門(mén)，代表了實(shí)現(xiàn)SOA自上而下的方法。
BPEL 提供了一種用于正式指定業(yè)務(wù)流程和業(yè)務(wù)交互協(xié)議的方法。通過(guò)這種方式，BPEL4WS 對(duì) Web 服務(wù)交互模型進(jìn)行了擴(kuò)展，從而使其可以支持業(yè)務(wù)事務(wù)。BPEL4WS 定義了一個(gè)可互操作的集成模型，有力地促進(jìn)自動(dòng)流程集成在企業(yè)內(nèi)部以及 B2B 范圍內(nèi)的推廣，包括甲骨文，微軟，IBM，BEA公司，SAP公司，惠普，Siebel和其他多數(shù)。他們中的大多數(shù)已經(jīng)有產(chǎn)品，支持BPEL的，其他人將很快推出。這本書(shū)解釋了BPEL標(biāo)準(zhǔn)，提供在BPEL中一步一步的指導(dǎo)，設(shè)計(jì)和開(kāi)發(fā)業(yè)務(wù)流程，定義了在SOA BPEL的作用，并討論如何關(guān)系到BPEL的Web服務(wù)和其它標(biāo)準(zhǔn)。它也包括兩個(gè)重要的BPEL服務(wù)器，Oracle BPEL流程管理器和Microsoft BizTalk Server。
該書(shū)介紹了業(yè)務(wù)流程定義面向服務(wù)的方法使用Web服務(wù)，這使我們能夠開(kāi)發(fā)松耦合解決方案