メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.651925524783 42.8228568439395, 141.651135468071 42.8235243206964, 141.651561101962 42.8237741210144, 141.651196429849 42.8240681039834, 141.650451760638 42.8246685752204, 141.648856027433 42.8236924161729, 141.649441495792 42.8232228532836, 141.649947185105 42.8228115974765, 141.650844849037 42.8220925744896, 141.651217117178 42.8222920192754, 141.651612903375 42.8225499626386, 141.651878477921 42.8227965332089, 141.651925524783 42.8228568439395)) ^^http://www.opengis.net/ont/geosparql#wktLiteral