Methods and apparatus to enhance queries in an affinity domain are disclosed herein. An example method of providing a query service in an affinity domain includes receiving a query including one or more template identifiers that indicate conformance with a standard related to content of a document; generating an expression including the one or more template identifiers to define a search of a registry; performing the search of the registry according to the expression, wherein the search is configured to identify documents including the one or more template identifiers; and conveying the identified documents to an entity associated with the query.