メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.900502063605 43.1000163260564, 142.897194424053 43.0994719343343, 142.897219178272 43.0993938692658, 142.897717918455 43.0978202992131, 142.900956356323 43.0983678824601, 142.900789806721 43.0989801369228, 142.900648608492 43.0994990603755, 142.900528583538 43.0999241833495, 142.900502063605 43.1000163260564)) ^^http://www.opengis.net/ont/geosparql#wktLiteral