The goal of the Nexus Event Service is to detect state change in services including the distributed Nexus Location Service. So far only state change on an isolated location service node can be detected. This work presents a model for distributed observation of events tailored to Nexus. With this model state change in a distributed set of location service nodes can be detected.

Although originally designed by and for the use of the Neutron and X-ray communities, the flexibility of the NeXus data format makes it equally suitable for storing data gathered from µSR experiments. Furthermore, its use should open up the possibility of sharing software beyond the immediate muon community; giving access to the many tools that are already in existence for manipulating NeXus an...