メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.439697013978 40.4937349473955, 141.439453480291 40.4942512049026, 141.43897368487 40.4952074726543, 141.438761932311 40.4956617795232, 141.438559609283 40.4960225268084, 141.437079518826 40.4945384792993, 141.436985111861 40.4944438170592, 141.43759210036 40.493158192058, 141.439697013978 40.4937349473955)) ^^http://www.opengis.net/ont/geosparql#wktLiteral