{ "items" : [
    { "id" : "http://dbpedia.org/resource/Base_metal"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A base metal is a common and inexpensive metal, as opposed to a precious metal such as gold or silver. A long-time goal of alchemists was the transmutation of a base (low grade) metal into a precious metal. In numismatics, coins often derived their value  from the precious metal content; however, base metals have been also used in coins in the past and today."] } } }
