メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2937500 38.1250000, 140.3000000 38.1250000, 140.3000000 38.1291667, 140.2937500 38.1291667, 140.2937500 38.1250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral