1. A computer-implemented method of providing a query service, comprising: enabling a user to select template identifiers from a plurality of available template identifiers via a user interface for inclusion in a query, the respective template identifiers indicative of conformance with a standard related to content of a document; when the user selects two or more of the available template identifiers for the query, generating, using a processor, an expression including the two or more template identifiers to define a search of a data collection system; selecting a query module assigned to a first one of a plurality of standards to handle the query based on at least one of the two or more template identifiers being associated with the first standard; and performing, using a processor, the search of the data collection according to the expression, wherein the search is to identify documents having metadata associated with received template identifiers.