メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.898774027427 43.4739893834957, 141.899098552498 43.4750105700232, 141.89743922259 43.4752684360961, 141.897149110779 43.4742538552666, 141.896996604115 43.4737681835634, 141.896951339799 43.4735701173461, 141.896889317702 43.4732988262778, 141.896624538806 43.4724172697026, 141.896662291551 43.4724095796233, 141.8978973176 43.4721575995522, 141.898203594858 43.4721106814709, 141.898676309484 43.4736527232464, 141.898774027427 43.4739893834957)) ^^http://www.opengis.net/ont/geosparql#wktLiteral