"One of the most exciting aspects of the Global XML Web services Architecture (GXA) is the ability to extend the architecture with composable processing protocols. These protocols, predominantly implemented through SOAP headers, can provide a wide spectrum of services including security, encryption, routing, and reliability. As you start building GXA-based applications, you will discover that GXA is a messaging architecture at the core. This messaging architecture provides interoperability between systems and services through a standards based encoding technology—SOAP. The majority of implementation work to date has been focused on SOAP 1.1 and WSDL compliant services so that Web service implementations could interoperate across various languages and operating systems. "
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