メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.653562452664 42.8366061296027, 141.653955685707 42.8372393465836, 141.654201198201 42.8376519320927, 141.653628610626 42.8378695805135, 141.653075414071 42.8380830375733, 141.652571054023 42.8373044924788, 141.651768840437 42.8361088605896, 141.652315462445 42.8359168276925, 141.652495851523 42.8358414591752, 141.652958067578 42.8356762003796, 141.653472195805 42.8364665407695, 141.653562452664 42.8366061296027)) ^^http://www.opengis.net/ont/geosparql#wktLiteral