After many years of working with GIS, this will be a first for myself. I have been asked to develop (ultimately) a web application of a water utility (from which data already exists) for tracking of outages. What I envision is a feature relation of valves and affected lines (i.e., someone in utilities edits the status of a valve and therefore it also changes the status of affected lines fed). How does one go about relating these features for outage purposes? Is the Schematics extension necessary to do this?