AP PI / XI is SAP's middleware technology ( Formerly known as SAP XI or Exchange Infrastructure ).

SAP has renamed SAP NetWeaver Exchange Infrastructure -- SAP NetWeaver XI -- as SAP NetWeaver Process Integration (SAP NetWeaver PI). NetWeaver PI serves as the integration engine for SAP's implementation of SOA middleware. With NetWeaver PI, SAP has included pre-built integrations for connecting SAP systems to each other and to non-SAP systems. But many SAP users are still not sure what the difference is between NetWeaver PI and NetWeaver XI.

SAP calls XI an integration mediator between entities with varying requirements in terms of connectivity, format, and protocols. According to SAP, XI reduces integration costs by providing a common repository for interfaces. The central component of SAP XI is the SAP Integration Server, which facilitates interaction between diverse operating systems and applications across internal and external networked computer systems.

The components of the SAP XI system are available via a web interface for configuration, integration design, system landscape definition and integration server monitoring.

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