1. A computer-readable memory medium containing structured data that stores a relationship query, the query configured to be executed by a computer processor under control of a search engine to search a corpus of objects for objects that match the query, comprising: a base component that specifies one or more values for desired relationship parameters; a prepositional constraint component that specifies a desired value for a prepositional phrase; a keyword constraint component that specifies one or more desired keyword values; and a metadata constraint component that specifies one or more desired values of metadata associated with each matching object; whereby, when the search engine causes the search to be executed, objects that match constraints specified by the base component, the prepositional constraint component, the keyword constraint component, and the metadata constraint component are determined to satisfy the query.