13. The system of claim 8 , wherein: said field is a first field; the presentation layer is further configured receive and to present the form comprising the first field and a second field; wherein the selected template further specifies how the search input in the first field and the second field is compared to the one or more data structures in the one or more data sources.
14. The system of claim 13 , wherein the selected template further comprises query specification data that is used by the query formulator to generate a structured query comprising: a first clause based on a first input from the first field; a second clause based on a second input from the second field; and a logical operator that specifies a relationship between the first clause and the second clause.