1. A method in a data processing system of specifying a relationship between configuration construct instances of a digital design in one or more hardware description language (HDL) files, said method comprising: in at least one HDL statement within one or more HDL files representing a digital design, specifying first and second latches within the digital design; in the one or more HDL files, defining a first configuration construct instance referencing the first latch and a second configuration construct instance referencing said second latch, said first and second configuration construct instances providing an interface through which values of said first and second latches are accessed; and defining, within said one or more HDL files, a link indicating a relationship between said first and second configuration construct instances.