Presenting a diagram indicating relationships among data items stored in a data management system includes: receiving a request that identifies a first data item stored in the data management system from a user interface; retrieving stored configuration information that includes a plurality of selection specifications for selecting data items in the data management system that are related to a given data item of a predetermined type, where each selection specification is associated with a different respective predetermined type; querying the data management system to identify a set of one or more data items according to a selection specification from the configuration information that is associated with a type of the first data item; for each of multiple returned data items in the identified set, querying the data management system to determine whether additional data items are identified according to a selection specification from the configuration information that is associated with a type of the returned data item; generating a diagram indicating relationships among data items identified using the configuration information; and presenting the generated diagram over the user interface.