OPC Xi (Express Interface) is the newest OPC specification from the OPC Foundation. Based on Microsoft's WCF .NET framework, OPC Xi enables a smooth migration from Classic OPC and supports communication through firewalls. The new OPC Xi (Express Interface) specification defines a .NET interface that eliminates the need for DCOM and .NET wrappers.
OPC Xi is based on WCF (Windows Communication Foundation) for fast local and secure communication through firewalls. With a rather simple data model, Xi provides an integrated set of methods for accessing both run-time and historical data, events, and alarms. The interface is designed to allow a simple mapping to the classic OPC DA, HDA, AE interfaces.
OPC UA, in comparison is designed for multi-platform communication and is based on a complex data model.
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Other OPC Xi Resources
OPC Xi Whitepapers: