14. The one or more non-transitory computer readable media of claim 12 , wherein said producing one or more URL fetch patterns corresponding to the particular web form based, at least in part, on the observed user interaction further comprises: automatically processing the observed user interaction and one or more candidate fetch URLs that are submitted as a result of the observed user interaction to determine a particular template URL for the particular web form and a set of parameters included in the particular template URL; wherein the set of parameters includes the particular parameter; identifying a particular dictionary for the particular parameter; wherein the first value for the particular parameter is indicated by the particular dictionary.
15. The one or more non-transitory computer readable media of claim 14 , wherein said identifying the particular dictionary further comprises: receiving, via a control associated with the particular parameter on a graphical user interface, information that identifies the particular dictionary; and associating the particular dictionary with the particular parameter.