The problem with that is that in most cases you still need a "string" based syntax that "people" can enter...
The XML syntax includes a <UserQuery> tag for embedding user input of this type.
I guess you can always have an "advanced search" page that builds and submits the XML query behind the scenes.
Contrib now includes a worked demo web app showing how a very typical search form is converted into XML using XSL. User input is a mixture of edit boxes for classic QueryParser syntax used on free-text fields but also includes drop-downs and checkboxes etc that map to other non-free-text fields.
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