Abstract: A graphical mapping interface and method are provided for creating and displaying a schema map, which is used by a data transformation system to perform a data transformation between a primary source schema and at least one target schema. The graphical mapping interface includes a main map window and a mini-map window. The main map window is adapted for displaying a graphical representation of a primary source schema. The mini-map window is adapted for creating a mapping between one or more nodes of the primary source schema and one or more nodes of an intermediate target schema, and displaying a graphical representation of the mapping within the mini-map window. Upon closing the mini-map window, a graphical representation of the intermediate target schema is displayed along with the primary source schema within a source schema region of the main map window and is accessible for mapping within the main map window.