メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.571092448725 42.9794808661137, 141.57081238068 42.9798803791678, 141.570540654143 42.9802787445736, 141.570477177514 42.9802759067951, 141.569193072305 42.9802032965732, 141.569244433059 42.979788853747, 141.569345642053 42.9790926772037, 141.56937457657 42.9788964824016, 141.569935511436 42.9789390591735, 141.57064515684 42.978981389867, 141.571364814684 42.9790236341352, 141.571092448725 42.9794808661137)) ^^http://www.opengis.net/ont/geosparql#wktLiteral