Abstract: A method (and structure) for displaying mapping relationships defined by a plurality of instruction elements, each instruction element providing a relation between zero or more source elements and zero or more result elements, where each source element includes one of a plurality of source elements and each result element includes one of a plurality of result elements, including providing a user a representation including a portion of the mapping relationships and including one or more of the plurality of source elements, the plurality of instruction elements, and the plurality of result elements. The user is provided a method to select one of the elements in the representation. The selected element is highlighted in the representation and the highlighting can be propagated to any other elements related by the mapping that are displayed in the representation.