Disclosed herein are : systems capable of searching, receiving and conglomerating the data from real estate databases of varying formats, and translating that received into a common format; execution of pre-defined translation rules referencing data tags used within the system or the originating databases; rules constructed in a simple, heirarchical or a class-based structure whereby one rule depends upon the output of another rule for its input; data sources prioritized or merged where the same property-related information is presented in more than one source; map definitions containing rule sets crafted for a particular use, such as for a particular consumer or user; such systems used in the course of real estate appraisals, in property search reports, extending across databases of differing formats. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.