| http://www.w3.org/ns/prov#value | - The usage of 'metal' to mean rocks and other minerals seems to have persisted until relatively recently, as I have maps, from the early 20th century, on which the legend distinguishes between 'metalled' and 'unmetalled' roads, the former having a protective surface, originally chipped stone.It is not unusual, of course, for the meaning of words to drift and for common words to take on special mean
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