An editing application may allow a user to change a literal property value of an object in a conventional manner. The functionality of the editing application may be expanded to allow a user to access non-literal values for property values, by allowing the user to define a calculation based on one or...http://www.google.fr/patents/US20070078735?utm_source=gb-gplus-shareBrevet US20070078735 - Blended editing of literal and non-literal values
