I'm pretty new to Dashcode, but I've started writing simple web apps pulling in data from an xml file. I'd like to be able to allow the user to enter a value for a parameter so that the web app would only query for data that has a value consistent with the parameter. Thus, if I have a list of names and I only want to bring in a list of people with the last name "Smith" how would I go about doing that? I can't seem to find any documentation on how to do this.