A process, and corresponding system for performing the process, is described for editing and representing property values for a digital map. The process stores a library of expressions for styling a digital map. The process retrieves electronic map data and displays a user interface including a property editor panel and a visual map portion. The property editor panel displays a plurality of map styles. The visual map portion displays a representation of the electronic map data. For a selected map style, the process displays a plurality of style properties and a text field for receiving expressions corresponding to a style property. The process receives, via the text field, an expression and determines a set of suggested expressions corresponding to the style property. The process applies the received expression to the electronic map data and renders in the visual map portion an edited representation of the electronic map data.