Loop-lifted XQuery RPC with deterministic updates

XRPC is a minimal XQuery extension that enables distributed query execution, combining the Remote Procedure Call (RPC) paradigm with the existing concept of XQuery functions. By calling out of a for-loop to multiple destinations, and by calling functions that themselves perform XRPC calls, complex P2P communication patterns can be achieved. We further propose the use of SOAP as the protocol for XRPC, which allows seamless integration with web services and Service Oriented Architectures (SOA). XRPC is implemented in the open source MonetDB/XQ