To support context-aware applications, it is beneficial to maintain shared context models that contain different types of information, like mobile objects, stationary objects, or spatially related digital information. This demonstration is about the NexusEditor, a graphical user interface to maintain spatial context models, interactively create queries, send them to a server and visualize the results. The contribution here is to show how schema awareness can improve such a tool: the NexusEditor dynamically parses the underlying data model and provides additional syntactic and semantic checks and short-cuts based on the schema information. Also, it supports export to existing information spaces like Google Earth.