7. A tangible computer readable storage device having instructions stored thereon that, when executed, cause a machine to at least: present a user interface to a user to enable the user to select template identifiers from a plurality of available template identifiers 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, generate an expression including the two or more template identifiers to define a search of a data collection; select 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 perform the search of the data collection according to the expression, wherein the search is to identify documents having metadata associated with received template identifiers.
7. A tangible computer readable storage device having instructions stored thereon that, when executed, cause a machine to at least: present a user interface to a user to enable the user to select template identifiers from a plurality of available template identifiers 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, generate an expression including the two or more template identifiers to define a search of a data collection; select 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 perform the search of the data collection according to the expression, wherein the search is to identify documents having metadata associated with received template identifiers. 8. A tangible computer readable storage device as defined in claim 7 having instructions stored thereon that, when executed, cause a machine to generate the expression to include one or more logical operators according to a desired logical relationship between the two or more template identifiers, the logical relationship being selected by the user.