In general, the subject matter described in this specification can be embodied in methods, systems, and program products for mapping an object type to a document type. A computer system stores configuration templates that each identify a mapping of an object type to a markup language document type. The computer system displays a graphical user interface that permits a user of the computing system to select a configuration template. The computer system displays a list of the at least some attributes and, for each of the attributes, the associated markup language attribute or element that is identified by the selected configuration template. The computer system receives second user input that changes an association of one of the attributes so that the attribute is instead associated with a different markup language attribute or element. The computer system stores an updated mapping of the object type to the markup language document type.