| http://www.w3.org/ns/prov#value | - Within each area sales information 12.1 . . . 12.N is derived from a suitable record source, and from that information an index is generated (step 14.1 . . . 14.N). [0029] Each area is well defined and, within the area, the nature of the property in question is defined e.g. a single dwelling with a single title deed, a residential dwelling in the nature of an apartment or condominium which may be
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