This book for architects and senior developers responsible for setting up Service-Oriented Architecture (SOA) for intra-enterprise application integration (EAI) and inter-enterprise (B2B) integration focuses on process-centric SOA to integrate existing (legacy) applications and modern solutions, using new technologies: web services, XML, Enterprise Services Busses (ESBs), and Business Process Execution Language (BPEL). Application integration within and between businesses to make up-to-date information accessible almost anywhere is a difficult task that is growing in importance. This book shows how to best integrate applications developed in different architectures and programming languages on different platforms with modern e-business solutions, develop web services, and process and manage XML documents from the JEE and .NET platforms. It demonstrates how to use ESBs for service integration and BPEL executable business processes for service composition into business processes.