http://www.w3.org/ns/prov#value | - A tax on the rent of land may be on a constant or variable valuation.A TAX upon the rent of land may either be imposed according to a certain canon, every district being valued at a certain rent, which valuation is not afterwards to be altered; or it may be imposed in such a manner as to vary with every variation in the real rent of the land, and to rise or fall with the improvement or declension
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